‘Sonic Visualizer’ is a music visualization app, SlowMP3 can slow and transpose MP3s and help identify chords in a song, BPMinus will let you change pitch and tempo and perform BPM analysis, ‘GBK Music’ can help find chords and scales for guitar, bass and keyboards, and finally ‘Pitch Ear Trainer’ can help you train your ear for perfect pitch recognition.
via Five FREE tools for Musicians (and music lovers) – freewaregenius.com.