Talk about a useful iPhone app for musicians. 7 Chords by Wunderwerk is a great example of a successful iPhone application that is not a game. Most folks think that only games can be very successful on the iPhone platform, but 7 Chords is not a game, and yet, it is very successful.

7 Chords is one of the few guitar iPhone apps available on iTunes, but is probably the most technical one. In essence, this cool little application teaches you how to learn notes and it even teaches you which fingers to use. Seven Chords comes with notes for both Electric and Acoustic guitar.

7 Chords note book is so comprehensive that you can use it as a chord encyclopedia. While the applications works well for intermediate guitarists, beginners can learn a lot with 7 Chords.

Price: $1.99