Actually, this deserves its own post, not just in the comments. Bored rhombus + keyboard + about 5 minutes + having just played Fire Emblem 4 = Funky Emblem: The Musical.

original game track: http://ucsu.colorado.edu/~scharff/Enemy01.spc
rhombus funky version: http://ucsu.colorado.edu/~scharff/rhombus-enemy1.mp3