iPlayMusic has a beta app for Mac users that they can use to learn chords on guitar (or piano, etc.), so they can play along to their favorite songs on iTunes. How awesome is that?! (This isn’t for those of you on Rock Band or Guitar Hero, sorry to say!) This is an awesome way to learn how to play a musical instrument, and/or learn how to play your favorite song. You can change the speed but not the pitch to help you learn, plus export to your iPhone or iPod to play anywhere, anytime.
Get the free beta at http://www.iplaymusic.com/.