Sweden-based music streaming service Spotify is worth billions of dollars, and has well over 140 million users as of early 2018 - 70 million being paid contributors.
When launching in 2008, it was a dream come true for many music listeners, however Spotify was not without its growing pains, as the Swedish company took years to expand into the United States and it was also years before a number of best-selling artists - including The Beatles, The Eagles, Pink Floyd and Metallica - agreed to have their music available for streaming.
The average listener can find just about anything they want - the catalog reportedly includes over 30 million recordings - but some artists' discographies are either incomplete or entirely missing.
Some of these titles not included on Spotify feature #1 hits and/or were recorded by artists who have sold tens of millions of albums. Potentially making more catalogs incomplete, a lawsuit filed last week by U.S. music publisher Wixen Music Publishing puts songs by Tom Petty, Weezer, The Black Keys, Fleetwood Mac, Neil Young, and The Doors in jeopardy, as Wixen is suing for for $1.6 billion in damages.
Alongside the above, there are many more artists whose catalogues desperately need to be completed, starting with...