"Steve's dead now. From here on in, Steve's death will be represented by the oboe."
A leitmotif is a piece of music used repeatedly to represent a character, theme, or action. This is a well-established technique used in almost every medium that involves music and story. The leitmotif technique was invented (or at least perfected) by opera composer
Richard Wagner in the second half of the 1800s. In his operas, not only would every character have his/her own motif, but also objects, places, and even abstract ideas.
Leitmotifs are often named simply "<character>'s Theme" or "<noun> Motif." They often make up the
bulk of movie and anime soundtracks, and a fair chunk of video game soundtracks as well.
This is different from an
Image Song in that Image Songs exist only outside of the scope of the show that produced them. Compare with
'I Am' Song.
If a character with a distinctive-sounding Leitmotif is in a production or episode that
breaks the Fourth Wall, one of his or her fellows may come to make a comment on how loud and annoying their theme music is. (To which the character will almost always reply, "What theme music?") Might be a
Musical Spoiler for audiences. The character might also have their leitmotif as their own ringtone, for a subtler joke. See also
Left the Background Music On.
If a character's leitmotif starts playing during an action scene,
start running.
Can become a
Recurring Riff when used throughout a long-running series. In video games, there's also the
Battle Theme Music. (If a character's
Battle Theme Music is a remix of their
Leitmotif, it's a
Boss Remix.)
Bootstrapped Leitmotif is a variation, where a song that wasn't originally intended as a
Leitmotif later becomes one.
See also
Mood Motif,
Standard Snippet.
Examples: