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Two things, one good and one bad. It’s free (with Prime Membership) - that’s good. However, there is a limited selection of songs compared to other music major streaming music services, about 1/20th of the selection on Spotify for example.
One thing that I haven’t seen mentioned is that Amazon will automatically rip music that you have physically bought through Amazon. When I was writing this I just went to the site, and it automatically added a Death in Vegas album that I must have bought in the late 90s. I don't have a clue where that CD is, but it was a nice surprise. That is probably the best feature of this service.