"I Guess I'll Always Love You" is a 1966 single by The Isley Brothers, released on Motown's Tamla label. It is a Holland–Dozier–Holland composition that was also covered by The Supremes for their album titled The Supremes Sing Holland–Dozier–Holland that was released in 1967 and also featured as the b-side to their single "In and Out of Love" that was released in the same year. The Isleys' version was reissued in the United Kingdom in 1969 and peaked at number 11, a much bigger hit than it ever was in the United States.
References
I Guess I'll Always Love You Wikipedia(Text) CC BY-SA