Ah, do not laugh at my attempted C!
Repent not, mocking maid, thy girlhood's choice—
The fervour of my love affects my voice!"
It's musical theatre law. The frequently good-looking, almost always lovestruck, and without a doubt naive young man central to the story must sing with lyrical, boyish grace. In other words: he's a tenor. In a large portion of opera (particularly Verdi and Puccini), The Protagonist is a tenor no matter what his age or personality.
- Any prince worthy of getting the girl and lines of song in Disney films is a tenor, but the Prince in Snow White and the Seven Dwarfs might be the tenorest of the tenors: he has only a few lines altogether, but dang if some of those aren't used to establish his bright and youthful timbre to complete a duet with Snow White's own Ingenue soprano. To Opera-Savvy viewers the more gruesome accusations about his motives and character simply don't make any sense.
- Quasimodo from The Hunchback of Notre Dame may not be especially good-looking (Ugly Cute, maybe), but he is a naive Nice Guy who sings with a tenor voice in contrast to Frollo.
- Christian from Moulin Rouge! has both the range and the standard personality.
- Behind the Candelabra: While we don't hear him sing, Scott Thorson's younger and hotter romantic rival for in-all-but-name husband Liberace is summed up by Scott:
There you are, you cock-sucking tenor shit!
- Troy in High School Musical but only the first film. His songs were written for a tenor but Zac Efron ended up cast - and he is a baritone. So Troy sings tenor in the first film, with Drew Seeley dubbing the vocals, and baritone in the remaining films.
- Wylan in Six of Crows is the youngest and the most optimistic and naive member of the crew, and has secretly spent the book harboring a crush he doesn't know what to do with. Naturally when he sings it's with a "shimmering, perfect tenor".
- The Jack Benny Program always had a tenor on board to sing popular songs, and he was always a Manchild and The Ditz. Dennis Day (replacement for Kenny Baker, who replaced Frank Parker) was the longest running and best developed of these, and once lampshaded this trope by saying "Tenors are a dime a dozen".
- Raoul from The Phantom of the Opera, though he has a noticeably lower tessitura and can and has been played by baritones (John Barrowman, for example). Notable for being hated by most of the fans. Ironically The Phantom himself is usually a tenor (see below).
- Marius Pontmercy in Les Misérables is rather tricky to place. He is often played by tenors, but has a slightly lower tessitura. However, he does fit the stereotype perfectly as the lovestruck and boyish innocent.
- Percy's actor in the musical version of The Lightning Thief will usually be this, using a higher range, impetuous belting, and boyish diction to convey the impression of a much younger person. Percy the character is twelve, but due to child labor laws and the sheer difficulty of getting someone that age who can carry a show, he's typically played by a youthful tenor in his twenties.
- Quasimodo in The Hunchback of Notre Dame stage version and the Movie. While his form is ugly his voice is beautiful; while he looks like a monster his personality is closer to an angel. It carries into the Disney film as well.
- The title character of Pippin is usually cast as a tenor, to represent his innocence. Originally the part was played by a baritone, though this required a few high notes to be sung in falsetto or otherwise dodged.
- Tony in West Side Story. He is, after all, based on Romeo, who by stereotype is incapable of being anything but a tenor.
- Gilbert and Sullivan have quite a few straight examples such as Nanki-Poo and Frederic from The Mikado and The Pirates of Penzance, respectively. They are complete innocents, but it's meant for laughs, as Gilbert and Sullivan are parodying sterotypical opera characters.
- Lensky from Tchaikovsky's Eugene Onegin: Innocent. Naive. Poet. Tenor.
- Rodolfo from La Bohème is a poor poet with a heart of gold and a voice of gold.
- Hoffmann in Les Contes d'Offmann. A wandering poet who has to use his tenor voice on no less than four different ladies throughout the opera.
- The Des Grieux from both Puccini's and Massenet's Manon operas are about as naive as a tenor can be.
- Tamino, Belmonte, Ferrando and Ottavio — all those gorgeous-singing Mozart tenors.
- The tenor roles in Donizetti's three opere buffe: Nemorino in L'elisir d'amore, Tonio in La fille du régiment and Ernesto in Don Pasquale. All are tenors, and in classic comedic style, total innocents.
- Parsifal, Stolzing, and Siegfried — the more "boyish" Wagner tenors. There's a point in one of the operas where Siegfried has to impersonate another character, a baritone. It's notorious difficult to pull off on stage. Some recordings of the opera get around it by having Siegfried sing the part in his normal voice and then editing it into a baritone. It's also been done on stage by having the actual baritone sing and act the part, then leave stage and "re-enter" as tenor Siegfried, which works since he's also supposed to be in magical disguise.
- Macheath in The Threepenny Opera is sometimes played like this ironically, and many performances have him singing the "Epitaph" in a sincere tenor, just to accentuate what a two-faced bastard he is.
- Viceroy Bánk the eponymous hero of Erkel's opera. Although he's far from being boyish.
- In the Handel oratorio Semele, the male lead is the god Jupiter (aka Zeus)—chief of the Roman pantheon, womanizer extraordinaire, and of course the god of thunder. But since he's portrayed as a lover in this story, he's a tenor.
- In Milk and Honey, the boyishly patriotic David is a tenor, though his baritone father-in-law Phil has the more demanding singing part.
- In Down in the Valley, Brack Weaver is a tenor or high baritone, while his older romantic rival Thomas Bouché sings bass.
- Edgardo from Donizetti's Lucia di Lammermoor, one of his more tragic operas. He's young, rebellious, and in love.
- Mario Cavaradossi from Puccini's Tosca, though because he's a spinto tenor, he'll hardly be boyish. But he qualifies for all the characteristics of a tenor: young, in love, an artist, and good-hearted.
- Likewise, Radames from Verdi's Aida is also a spinto tenor, so he's hardly boyish.
- Orpheus from Hadestown is another classic example, particularly Reeve Carney's take on the role. Doubly so when he's singing the refrain from the Epic triad. Triply so any time his voice is thrown into contrast with that of Mr. Hades.
- In The Most Happy Fella, Herman is the naive Butt-Monkey of the workers and eventual male half of the Beta Couple, and his light tenor voice is the highest of the male quartet that sings "Standing In The Corner."
- In Ariadne auf Naxos, Bacchus, the overpoweringly handsome Physical God with a romantic claim on Ariadne, has a relatively brief but demandingly high Heldentenor part.
- The SpongeBob Musical: SpongeBob fits this trope to a T, though it's largely justified by the fact that his cartoon counterpart similarly has a tenor singing voice and a naively optimistic attitude.
- In Disney's Aladdin, protagonist Aladdin is a baritone. Justified since his role doesn't follow the straitlaced archetype in the first place, instead he's an affable rogue. Yet still, he is the heroic young male lead and he does get the girl. Interestingly enough, Brad Kane, who provided the singing voice for Aladdin, also played Arpad in the 1992 revival of She Loves Me.
- The particularly boyish Arpad in She Loves Me is a lyric baritone.
- In Bock and Harnick's, Fiddler on the Roof, Perchik—though only arguably classified as an ingenue—is also a lyric baritone.
- Jean-Michel of Jerry Herman's La Cage aux folles wavers somewhere between baritone and tenor.
- Freddy in My Fair Lady also wavers somewhere between baritone and tenor.
- Gilbert and Sullivan with Grosvenor and Strephon in Patience and Iolanthe, both being lyric baritones (though Strephon originally played by bass Richard Temple). Somewhat averted in Ruddigore: Dick Dauntless doesn't turn into an evil baronet and he has the romantic-style music, but he's also, well, a dick, and doesn't get the girl. Also lampshaded like hell in the Act II opener of Utopia Limited, with Captain Fitzbattleaxe's song about how you can't sing in those high ranges if you're actually overcome with emotion instead of just acting.
- Porgy and Bess: Porgy, an ingenue in love if not in age, is a bass-baritone; the bad guy Sportin' Life is a tenor.
- Gabe Goodman in Next to Normal is a tenor, but is actually a (sorta) villainous ghost-child. His father Dan is also a tenor, but is middle aged and doesn't really fit the trope other than being a nice guy.
- Jean Valjean, the lead in Les Misérables, is a dramatic tenor, but he's an ex-convict rather than an ingenue, and is traditionally played by a middle-aged man.
- Verdi's opera Rigoletto subverts the trope. The Duke is a good-looking tenor that all the girls fall for, but he's the opposite of an innocent - he's a Manipulative Bastard who doesn't care what happens to the women he seduces and abandons.
- Pinkerton in Madame Butterfly is a heartless bastard, very similar to the Duke.
- And in Janacek's Jenufa, we have two tenors: Steva is a jerk who knocks up poor heroine and then leaves her, Laca is a neurotic who cuts her face in a fit of jealousy (that's why Steva leaves her, What Measure Is a Non-Cute?).
- Figaro in both Rossini's The Barber of Seville and Mozart's The Marriage of Figaro flies around the town amorously, but in both cases is played by a bass-baritone.
- Inverted with Peter Grimes — the titular character is the furthest thing from an ingenue. Britten did this all the time. Living with a tenor who was definitely not an ingenue might have something to do with it.
- Aschenbach from Death In Venice is an aging writer with a fondness for Bishōnen.
- The Madwoman in Curlew River is a drag role.
- Captain Vere from Billy Budd is a father figure in the flashback part and very old (or possibly even undead) in the Prologue/Epilogue. Further inverted in that the boyishly handsome title character is a baritone.
- Another baritone is the titular young idealistic hero in Owen Wingrave
- CB of Starlight Express, who while starting out like a stereotypicial Tenor Boy, is soon revealed to be a giddy and sociopathic Ax-Crazy Serial Killer.
- In the opera Salome, Salome's beloved Jokanaan is a baritone, while Herod the king is a tenor. Played straight with Narraboth, the young Syrian who moons after her.
- In Charlie and the Chocolate Factory, Willy Wonka is a tenor. He appears to be middle-aged but is actually much older, and is an Anti-Hero, a Large Ham, a Mad Artist / Mad Scientist hybrid, and a Gentleman Snarker — though he turns out to have a softer, dreamier side.
- In the opera adaptation of The Fly (1986), the two male corners of the Love Triangle — Adorkable, never-been-in-love-before Seth Brundle and manipulative, jealous, worldly Stathis Borans — are a bass-baritone and tenor, respectively. This hints at what each character becomes over the course of the story as Seth mutates into a deranged Half-Human Hybrid and Stathis becomes the despairing Veronica's confidant. The overconfident barfly Marky — whom Seth gruesomely defeats in One-Sided Arm-Wrestling — is also a tenor.
- The Phantom from The Phantom of the Opera is usually a tenor (hitting the high notes in "Music of the Night"), despite being an Anti-Villain, and certainly not boyish or naive in any way.
- Ni no Kuni II: Revenant Kingdom: Supporting Protagonist and Audience Surrogate Roland Crane is a tenor for most of the game (his older, First World version is a raspy baritone to indicate his age), but, being a professional politician, he's the resident Guile Hero, Deadpan Snarker and Only Sane Man. He's also very much a stoic most of the time, and supremely uncomfortable with the female attention his suddenly regained youth generates due to being a widower.