The Isley Brothers original recording of "Love Is A Wonderful Thing" (R. Isley - O. Isley - R. Isley) was cut in 1964 as produced by Bert Berns and was released in 1966 as a single for United Artists. This bubbled under the Top One Hundred.

Michael Bolton reached number four on Billboard with "Love Is A Wonderful Thing" (Bolton - Goldmark). The album "Time, Love & Tenderness" topped the charts in 1991. Completely different lyrics other than the obvious chorus. Wikipedia: "The Isley Brothers filed a lawsuit for copyright infringement against Bolton, Goldmark and Sony Music Publishing. "When I first heard his version of the song on the radio, I was really pleased," said Ronald Isley. "Then I went out to pick up the record and looked for my credit. I was upset because the credits weren't on there. So we got in touch with his people and then he went into the 'Oh, I didn't know you all had a song like this.' That type of thing." "On April 25, 1994, a Los Angeles jury ruled in favor of the Isley Brothers. The jury determined there were five instances in which the Bolton/Goldmark song plagiarized the Isleys' tune. They ruled that 66 percent of the song's profits came from copyright-infringed material and 28 percent of the profits from the album Time, Love & Tenderness were derived from the track. Bolton, Goldmark and Sony Publishing were ordered to turn over more than $5 million in profits from the sales of Bolton's version of the song to the Isley Brothers. It was the largest award in history for plagiarism in the music industry."