It was released as a single on January 28, 1969, with "My Cherie Amour" on the B-side.

A few months later, the single was re-issued with sides reversed because of the growing popularity of "My Cherie Amour", which became a Top Ten hit.

[1] Cash Box stated that "Wonder is softened just a trifle on this slower and more dramatically developing ballad.

A rendition of "I Don't Know Why" by the Rolling Stones is included on their 1975 rarities compilation Metamorphosis.

It was also the night that news broke of former guitarist Brian Jones' death, less than a month after he had been fired from the band.