The band 's classic and current lineup is singer H.R. , guitarist Dr. Know , bassist PERSON@1 , and drummer PERSON@2 , H.R. 's younger brother .

The members are : H.R. -LRB- singer -RRB- , `` Dr. Know '' -LRB- guitarist -RRB- , PERSON@1 -LRB- bassist -RRB- and PERSON@2 -LRB- drumer -RRB- .
