"In Search of the Lost Chord" is a song by the British rock band The Moody Blues, released in 1968 on their album of the same name. The track explores themes of spiritual quest and the search for deeper meaning in life, using rich orchestration and poetic lyrics to convey its message. The song is notable for its blend of rock and classical music elements, featuring instruments like the melotron and flute. It reflects the band's interest in philosophy and mysticism, resonating with the counterculture movement of the 1960s, which sought enlightenment and self-discovery.