27 DRM and Apple Music
Capo can open, play and analyze the songs you purchased from the iTunes Store, or compatible audio files that you imported into your music library. As with all apps, Capo cannot play music that is protected using Digital Rights Management (DRM) technology.
Note that music from the Apple Music streaming catalog is protected by DRM, and songs must be purchased from the iTunes Store before Capo can access them. Learn more on our website.
27.1 Capo Can’t Work With Streaming Music
Capo needs to “look inside” the song in order to draw its waveform, calculate the spectrogram (on the Mac), and to analyze the song’s beats, chords, and key. But if an app can “look inside” the song, it can also make a full copy of it. That’s the core issue here: if you could make (and acquire) copies of the music you stream, then why would you keep paying for the service? This is why apps like Capo cannot function with streaming music, and also why Apple hasn’t provided developers with a “safe” (for the music industry’s revenue) way to do this.
This might change one day, and we have seen signs that Apple is testing the waters with this idea. But so far we haven’t found a way to integrate with Apple Music without removing major functionality.