Spotify is a sensational resource for lovers of music. If you want it for free, you have to put up with the adverts. For £4.99 a month you lose the adverts. For £9.99 a month there's no advertisement, enhanced sound quality, and you can listen off line as well as listen to your playlists on your iPhone/mobile. I'm still on the free package and use it extensively to access millions of tracks, including latest classical releases.
I've just come across Spotify Classical which consists of a huge number of playlists, some predictable, some highly creative. Again, it's a terrific resource for music lovers.