Well i know a lot of music haha. Here's my favorites in the different genres i listen to the most.
Metal: Avenged Sevenfold (quite heavy in the normal listeners ears, But suitable for the mainstream metal fan) Obscura (Technical death metal, If you're into geek metal this is a band for you haha) the faceless (also technical but has a very unique sound that words cant describe)
Hiphop: Token (young dude from massachusetts, who's really skilled on the lyrical spectrum as well as the technical) Jarren Benton (savage, angry lyrics, used to do a lot of song with hopsin in his early days) Terror Reid (this is a cool project made by a dude called Getter, who has produced a lot of huge hits and this is his own project, he keeps it old school, and yet hes innovative, and a little funny aswell) Pink Guy (this one is actually a troll act, But the songs are offensive, and odd. But still tight rhymes and great humor)
Jazz: Angelo Debarr (This is one of the greats in one of the oldest know jazz genres, called ''gypsyjazz''. He's got some very impressive musical skills that is out of this world) Bireli Lagrne (pretty much as Angelo Debarr but a different play style. Also GypsyJazz) Frank Sinatra (Got that vegas vibe going on for him. Mostly cheesy love songs, but in the best way possible) Count Basie (just an amazing musician, who's featured so many song with so many great artists. Everything you see with this guys name on it should be of quality)