Ask HN: Pandora like station creation alternatives on other services?

My Pandora subscription is expiring and given their delays in bringing premium to the desktop, I'm looking to move on to a service that plays on the Echo in addition to the desktop. I've looked at multiple other services and cannot find the ability to create a personalized station by seeding it with a few groups I like. On Pandora, you create a station, give it some names and Pandora learns from there what you like by the thumbs up and down. You don't have to manage it past the thumbs up and down. I just like to set it and forget it. Every other service I've looked at lacks the ability to introduce new music automatically and/or personalize the station. Spotify offers the ability to create stations, but you have to manually add music. Amazon automatically adds to stations, but you cannot save them as your own. Google Play has a feature like this, but doesn't play on Echoes. What have I missed?