Chesky discs and Telarc have excellent mostly Classical recordings...Chesky has great Jazz also.
For Rock N Roll, Dire Straits, Tom Petty, Pink Floyd, 3 Doors Down all have generally very well recorded albums.
Jazz, Jazz at the Pawn shop...most Jazz sounds good to be honest.
Country, Clint Black, Alan Jackson but watch for latest compressed tittles.
Blue Grass, Allison Kraus and Union Station, Nickle Creek.
Blues, Robert Cray
Rives Audio, Stereophile and Chesky all have samplers to describe what the songs intent was..(height, warmth, scale, Dynamics)