Collaborative listening platform Soundrop, which initially started out as a Spotify app, launched on the competing music subscription service Deezer Monday. Soundrop offers Deezer users access to tens of thousands of so-called social listening rooms, which offer up music streams curated by its community. Many of these rooms are genre-based: Soundrop has rooms for Progressive Metal, Minimal House, K-Pop, Reggaeton and pretty much any other genre you can think of.