They delivered  the 60s summer clean cut california scene which they were a part of, themselves. Early use of the moog synthesizer throughout the 60s and 70s as seen in recording studio footage of Brian Wilson.  Harmonies and the music beat out the stale east coast 60s groups, such as the 4 seasons' simple ditties. Not all the songs are great. But unlike the giants of the composers of the 1930s, like cole porter, gershwin and harold arlin, they performed sang and played their own.