- We have the theme song for starters. It really helps describes Milo's everyday life.
- Dan and Swampy were supposed to be interviewed for the show when it was new. What we got instead was "We're Gonna Do it Again", a rap from Dan and Swampy as a sequel to their previous rap "Animatin'".
- Milo sings a catchy ditty about rooting for the opposing team in "Rooting for the Enemy".
- The Doctor Zone Files theme song is pretty dang catchy.
- The great song that sounds during the race in "Party of Peril" makes us forget all the accidents that are happening during this one. With a full version available here.
- There's a song suitably awesome for Veronica about wanting a girl in armor.
- While it's kinda goofy, "Chop Away At My Heart" is pretty awesome.
- "We're going to the zoo, we're going to the zoo, and then we're gonna see some animals..." this'll get stuck in your head for a while.note Extra points for that same episode giving us a little nod to "Squirrels in my Pants"!
- "School Dance" gives us a rather sweet song, "I Need a Little TLC", for when Milo is trying to repair Amanda's school dance. The same episode also gives us "Just Roll With It", when Zack's band fills in for the hired band that went missing. An extended version of this song is also shown in "Disaster of My Dreams".
- Better buckle up and hold on tight, as "Battle of the Bands" gives us "A Bumpy Ride Tonight".
- You probably won't find another song about chasing (or getting chased by) a stampeding horde of llamas quite like this one.
- Elliot Decker gets a song! Many Phineas and Ferb fans will undoubtedly be reminded of Doofenshmirtz's showstoppers.
- "Don't Worry Baby", a zippy little tribute to Diogee's Undying Loyalty.
- The incredibly sweet song by Milo. Bonus points if you recognize the tune of the song. note
- The Halloween special gives us the extra-catchy "The Last Halloween" with Dakota getting into the Halloween spirit.
- "The Phineas and Ferb Effect" gives us two new songs: "Pressure", a song with a sudden rap segment in which Orton and Doof go through their woes that they're being regarded as important icons in the future, but have no idea how they will achieve it, and "How Do I Do It", a song sung by Milo when Phineas and Ferb research Murphy's Law that's clearly inspired by Bruno Mars. Also the Pacific Rim-esque Music during the final battle, that notably starts off when Phineas, Ferb, and Milo show up in a giant robot.
- Recurring Raccoon's short but sweet theme song is introduced in this season, although it's not exclusive to it. If you've heard it here, you're gonna hear it again soon.
- "Cake 'Splosion!" introduces the theme song of the eponymous TV show, and it conveys the excitement such a TV show would bring very well, even if it were shameless promotion. From the same episode, "Don't Say It's Over" is a nice, semi-dramatic songlet for when it seems Milo and Amanda are about to lose, and it has a really satisfying instrumental rock ballad variant when Milo and Amanda won shortly after.
- In "Managing Murphy's Law", Just Getting Started writes an all-new song that confirms their band name as definite. Although we may not hear the entire thing and there are a lot of other things going on during the performance, making for plenty of distractions, it's still a damn good song.
- "Field of Screams" includes the song "I Chase You, You Chase Me", which is a blood-pumping, energizing song that really sets the mood of the teenagers getting chased through a cornfield, while a knife-like metallic windmill spins wildly out of control right at them. On its own, the song is just ... good.
- There's "The Mid Afternoon Snack Club"'s "Looking High and Low for Milo", which is not only catchy as hell, but just hilarious in that it contrasts dark and gruesome lyrics with a happy, upbeat tempo.
- The James Bond-esque opening theme to the season finale "Sphere and Loathing in Outer Space" is a phenomenal tune with breath-taking visuals of outer space.