Wilson produced the backing track for "I Know There's an Answer" (then slated and logged as "Let Go of Your Ego") on February 9, 1966 at Western Studio. With the exception of an overdubbed banjo, played by Glen Campbell, the track was recorded live with an orchestra of 15 musicians. Before one of the takes, Wilson jokingly referred to the song as "Let Go of Your Libido", mispronouncing "libido", after which he asked if anyone had heard the 1959 comedy album "How to Speak Hip". He recorded a guide vocal for the track later that day.