7 Chords: If you’ve always wanted to improve your knowledge of guitar chords or music theory, look no further than 7 Chords. Despite the deceptive nature of the program’s title, 7 Chords is essentially a database with over 10,000 guitar chords laid out in both standard notation and chord shapes. Oh and if you’re trying to figure out if a certain chord would sound in a song, 7 Chords can also play each note in a chord without going through the trouble of hunting around your fretboard. Additionally the program utilizes the iPhone’s impressive display and polyphonic sound, while the program itself has a breathtaking and intuitive interface. If you ever wanted a composing tool that you could keep in your pocket, 7 Chords is the ultimate program for you. Price: $1.99 [iTunes]

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