Harmonium is, to put it plainly, a musical doodling tool. The user can manipulate notes on a 16x16 grid to create melodies within a pentatonic scale. On top of this already addictive concept, you can bring things to life by enabling Conway's Game of Life!
Music Quiz v0.1 Music Quiz v0.1
Here's a unique little quiz game from Sony PlayStation Portable homebrew developer Xevious86 - it's one that makes the questions based on the music tracks you have in your /PSP/MUSIC folder. A very cool idea, and in execution, it's pretty awesome.
For the uninitiated, playing Music Quiz is pretty simple