I've been using Spotify since ??? and I'm really quite happy with it - the ads are not too abusive - and I'd say I have 9 out of 10 success when searching for a title or singer/group.

It's also very rapid, more so than Deezer or Grooveshark (browser-based) and I particularly like the elegant interface.

Here's my cat who doesn't know if she's a cat or a plant (in a pot)

May I suggest Inscribe