"So Deep Within You" is a 1969 song by the progressive rock band The Moody Blues. Written by the band's keyboardist Mike Pinder, it was first released in April 1969 as the B-side to the single "Never Comes the Day." It was later released on the 1969 album On the Threshold of a Dream, which "Never Comes the Day" was also included. "So Deep Within You" is primarily driven by Mike Pinder's voice and Ray Thomas's flute, and it is an upbeat love song, and the lyrics describe the feeling of unrequited love: And now I'm lonely, I want to feel the love so deep within you