"Isn't It Time" is a song from the American rock group, The Beach Boys. The song is the second single released from the band's twenty-ninth studio album, That's Why God Made the Radio.
A special single version was released as an EP with live versions of "California Girls", "Do It Again", "Sail On, Sailor" from Chicago on September 28, 2012 on iTunes, and was also included on the The Beach Boys 2012 compilation album Fifty Big Ones. The "Isn't It Time" (single version) is a significantly remixed and partially re-recorded version.
According to Mike Love, "We actually did a little bit of extra work on the bridge to make it more of a four-part (harmony) thing and changed the lyric a little bit as well" 
The Beach Boys