Smith, of course...

Smith was a California rock band that roared to #5 in 1969 with a cover of a song that had already been a hit twice... the old Shirelles and Beatles tune "Baby It's You".  The Smith version out-charted it's predecessors and sold over a million copies.  Unfortunately, the band broke up not long after, and band members never repeated their one-hit wonder success story.  It's a shame, because the song deserves airplay but instead is a forgotten oldie.
watch it here