You are welcome, likewise
I recommend Spotify. I bench-tested it one time to see if I should recommend it to a friend. It was VERY good at picking singers/groups I would already like.
I told Spotify I liked Sara Groves, and it recommended other singers... who were already in my collection. So I clicked on those and Spotify recommended a few more... that were also already in my collection.
I have a music collection, so I don't use Spotify for daily listening. It's awesome for finding new singers I'll like though.