Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Nice and rough.

Old time music played the way it should be - with passion and finesse but still nice and rough sounding. David Bass's fiddle is beyond impressive, but the band as a whole really cooks. They're so tight and rockin' that it's easy to forget that there's no drummer here. An antidote to an encroaching slickness in a lot of contemporary bluegrass.