Spotify is considered to be the most-popular and successful music streaming service out there at the moment, but what about YouTube? It may be a video-sharing service, but how many people do you think listen to music through YouTube every day? Even though that music is in the form of a video, it’s still music streaming, and if you counted YouTube as a music streaming service, it would definitely be the most-popular. With that in mind, it’s not surprise that YouTube has decided to cash in on its massive arsenal of music videos and active userbase by launching a separate app that’s dedicated solely to music streaming.