Do any other Apps let your stream based off Genre's, like Slacker? I may have totally missed it, but I don't see anything like this in Zune on my phone. "Playlist" in Zune is terrible, IMO. My issues with Slacker are, limited selection. I get tired of the same stuff all the time. Oh... The damn App doesn't work! Like, at all. If I'm able to actually get a channel streaming (haha, yeah right), good luck getting beyond 1 song. Lastly, Nickleback is NOT hard rock! Come on... I don't hate Nickleback, but let's atleast get the genre's right.
I love Zune, and will continue to pay for it just for the offline cache ability, but I need something else to "discover" new music based off my interests.
I have considered iHeartRadio and just trying a bunch of rock stations from bigger cities. My local station is terrible. Rdio isn't what I'm looking for. I have a hard time swallowing another $10 to pay for Spotify. Even if I did, the App never actually started a song during my free trial. (There is a theme of streaming Apps not working here...) Pandora is not what I want, even if we had it. I guess I haven't really looking into Last.fm.
If I'm wrong about the ability of these Apps, please let me know. For instance, if Rdio can play based off Genre alone. At a quick glance, I can even add individual songs to my "Collection" only whole CD's. That can't be the case... Lol. Or if you can listen by Genre's through Zune, man, that would give me what I want.