If you're talking about Rap, for me, it's mostly West Coast underground. My list varies from time to time, but lately I've been playing...
40 Ounce (recently, ACPOW and PLAYA'S ASSOCIATION CDs)
Done Deal (Quinn, Fully Loaded, etc.)
Right Way (RBL, Black C., Prime Minister, etc.)
Hollow Tip (TAKIN NO SHORTS II lately)
Luni Coleone & I-Rocc's new one
Messy Marv (everything)
Selected Get Low recordings (the non-comps, mainly) Mac Dre and his associates (PSD, Dubee, etc.)
Sic-Wid-It shit (old and new)
Keak The Sneak
Mob Figga-associated CDs (AP9's HEADSHOTZ, both Jacka CDs, Rydah J. Klyde's solo, etc.)
Spice 1
PEACE!