Guess The Genre #2822 (Gathered by Ken Anderson)

GreatSocietyMatrix GratefulDeadMatrix
BluesProjectMatrix VelvetUndergroundMatrix
JanisJoplinBigBrotherMatrix SantanaMatrix
DoorsMatrix SteppenwolfMatrix
BobMarleyWailersMatrix DavidCrosbyGratefulDeadMatrix

Answer: The Matrix - Next is Guess the Genre #2823

Or, I don't want to guess - Show Me A List