Muses don’t schedule appointments. They aren’t fine with being told to “please hold.” If you don’t have time for her at the moment, there are plenty of buskers down the street who will. Left your guitar at home? Not her problem. Of course, she might think that your iPhone merits some extra inspiration, that is, if you have Star Guitar.

Chordica is a fun and easy to use music app. It’s innovative design lets you memorize songs using numbers instead of notes, which allows you to play a song in any key using the exact same screen taps. The app has a good sounding piano sample and enough adjustments to allow flexibility without being overwhelming.