What are some good music apps on the Apple App Store?

What are some good free apps where you can download music and preferably you can edit the tags (It's annoying when there's tons of random numbers and stuff on my songs) for iPhone.

Hi
-Spotify
-Rdio
-Songza
-Pandora
-Beats Music
-Slacker

Try Spotify you can stream your favorite music and also create and share your own playlist with everyone.