A character's strength and abilities are directly proportional with how cool their personal theme music is. The more suddenly it starts up and the louder it is, the more butt-kicking is about to commence. This applies to both heroes and villains and is a power that the Badass Normal is allowed to use. Alternatively, the music is a representation of the character getting into "the zone". Video games will sometimes have a variation of this, where a specific jingle plays during temporary power-ups, like invincibility due to an Invincibility Power-Up; see Power-Up Motif.