There are times when you want to listen to music, but may be tired of what’s on your iPod or iPhone. Sure, you can check out a streaming service, such as Pandora or Spotify, but you might want to make your own music for a change. Not by composing music—unless you’re not a musician, of course—but by using one of a handful of apps to “doodle” with music, in what can be an interesting (and relaxing) process....
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