Love this question. Made me think quite a bit.
Classical - my wife worked for Houston Grand Opera when we first got married, and so I got dragged to a lot of performances. After a while, I really "got" it, and now I'd go see an opera long before I'd see a musical. Also, one of our neighbors is one of the feature baritones for HGO.
Verdi's Rigoletto is my current fave.
Blues -
Buddy Guy "
Baby Please Don't Leave Me" An absolute apocalypse. I also love
R.L. Burnside.
Old Rock - I'm sure others here are fans too, but I really like
The MC5.
Jazz - Sorry, I'm uncultured. So this is my metal/hardcore placeholder. Listen to
Coalesce. It's a lot more than just screaming. Crazy time signatures and tonal shifts. Wait, that's jazz, isn't it?
Alternative -
Raury. A lot of his stuff could be classified as hip-hop, but he jumps genres like crazy. Not bad for a kid who can't drink legally yet.
Country - As an Aggie, I'm legally obligated to pick Lyle or REK, but I'm going with
Drew Holcomb & The Neighbors here. Even if his latest stuff feels a little too polished, we'd all be better off if all Nashville country sounded like this.
Neil, did you get to see Sarah Jarosz open for Nickel Creek? That was my first exposure to her, and was blown away.