Joseph Coleman Smith (17 May 1934 – 5 September 1998), who performed and recorded under the name Sonny Knight, was an American singer, songwriter and author. His biggest hit was "Confidential", which reached the pop and R&B charts in 1956, and he continued to record into the 1960s. In 1981, using his real name, he wrote The Day the Music Died, a fictionalised account of racism in the American music business in the 1950s.
He was born in Maywood, Illinois, and moved to Los Angeles with his family in the early 1950s. He enrolled at Los Angeles State College intending to pursue an academic career, but became interested in the music business and, according to one source, visited the Mesner brothers at Aladdin Records to sell them a song, "Vicious, Vicious Vodka", that he had written for his idol, Amos Milburn; Milburn recorded the song in 1954. 
After a couple more unsuccessful singles, recorded again as Sonny Knight, producer Robert "Bumps" Blackwell partnered him with songwriter Dorinda Morgan. She wrote the ballad "Confidential", which he recorded for the small Vita record label in Pasadena.
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Although the record label states that it was recorded with the Jack Collier Orchestra, in fact it was made with the Ernie Freeman Combo, which also included guitarist Irving Ashby and saxophonist Plas Johnson. Originally the B-side of "Jail Bird", the record was flipped by radio DJs. After initial local success, the record was licensed to the larger Dot label, and rose to no. 17 on the Billboard pop chart, and no. 8 on the R&B chart at the end of 1956.
Although the record label states that it was recorded with the Jack Collier Orchestra, in fact it was made with the Ernie Freeman Combo, which also included guitarist Irving Ashby and saxophonist Plas Johnson. Originally the B-side of "Jail Bird", the record was flipped by radio DJs. After initial local success, the record was licensed to the larger Dot label, and rose to no. 17 on the Billboard pop chart, and no. 8 on the R&B chart at the end of 1956.
Knight died in Hawaii in 1998 at the age of 64, following a stroke two years earlier.
A compilation CD of Sonny Knight's recordings, Confidential, was issued by Pacific Records in about 2001. (Edited from Wikipedia)
Here’s a clip of Sonny Knight with “If You Want This Love of Mine,” taken from American Bandstand. February 27, 1965.