I spent HOURS (maybe DAYS :-)) searching for, compiling and renaming these 55 MP3 files to make them teacher-friendly.
They are all theme songs and commercials in the public domain, so there are no licensing or copyright issues.
I renamed the files with a number in front which indicates how long the "song" is. So, for example, if I want a 1-minute transition, I might choose "59 Teenage Mutant Ninja Turtles" which is 59 seconds, or "103 Scooby Doo" which is 1 minute and 3 seconds.
It gives the kids a chance to get up and wiggle a bit while we're transitioning from one lesson to the next... or if we're settling down from coming in from recess, etc.
I have a "Detective" theme in my class, so many of the songs are old crime-fighting theme songs (Shaft, Miami Vice, Hardy Boys). I love hearing the old themes & commercials while the kids love some of the newer, video game themes.