If you're on Windows (or Linux with WINE), I recommend using Falcosoft's Soundfont MIDI Player to listen to them, as they may not play properly on other players.
Making Fiends Theme Song
Ego Plum, Amy Winfrey
5.82 KB
Gravity Falls Theme Song
Brad Breeck
31 KB
The Fairly OddParents Theme Song
Ron Jones, Butch Hartman
22 KB