Apps
MIDI Score
It's an app that converts MIDI files to sheet music. While you are listening to music, you can see musical notes synchronized.
All Sheet Music
All Sheet Music is a sheet music reader that supports PDF, Image, Text, and MIDI files.
iSongwriter
You can create a song, too! Create your own song using iSongwriter. With a little musical knowledge, you can create an awesome song.
Song Wizard
An idea of writing a song. Automatic Song Generation, and Flexible Editing
Guiboard
Use your Guitar as a MIDI Keyboard!
JangKi+
It's a Korean Chess (JangKi) app.
Song Memo
Song Memo is the easiest way to take notes of your song ideas. The chord keyboard of Song Memo allows you to write chord progressions more quickly.