Spotify has long been thought of as a digital jukebox, allowing users to summon virtually any song at the click of a button. But the cracks in that system are starting to show, as artists attempt to exert more control over their music.

Some artists, like Taylor Swift, have argued that Spotify’s business model devalues music. (The service has an ad-supported free tier, unlike many other on-demand streaming services.) Others have been quietly removing their albums from the platform for other reasons. It’s not just a Spotify issue, either. Competitors like Tidal, Apple Music and Google Play Music also have notable gaps in their libraries.

Here’s a quick look at 11 albums from major artists both past and present that you won’t find on Spotify, the world’s most popular subscription streaming service. The list, and the artists’ varying reasons for keeping their music off the service, illustrate the challenges listeners will face discovering songs in an increasingly fractured music world.

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