Claim: The Beach Boys leader was not Brian Wilson.
Evidence: The group 's original lineup consisted of brothers Brian , Dennis , and Carl Wilson ; their cousin Mike Love ; and their friend Al Jardine.
Brian Douglas Wilson -LRB- born June 20 , 1942 -RRB- is an American musician , singer , songwriter , and record producer best known for being the multi-tasking leader and co-founder of the rock band the Beach Boys.