Genius on many levels
Every once in a blue moon someone makes an app of genius. This is one. If you want a splendid vehicle to find and enjoy music: this is it. If you want a painless music education, this is it. If you want a tool to store and replay particular music experiences, this too is it. Get it.
If you like it, you might also want to try the CBC Music app, great content even if a more workmanlike than genius-level application.
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NPR Music, v3.0