John Laird Abercrombie was an American jazz guitarist. His work explored jazz fusion, free jazz, and avant-garde jazz. Abercrombie studied at Berklee College of Music in Boston, Massachusetts. He was known for his understated style and his work with organ trios.

John Robert "Johnny Hammond" Smith was an American soul jazz and hard bop organist. Born in Louisville, Kentucky, he was a renowned player of the Hammond B-3 organ so earning "Hammond" as a nickname, which also avoided his being confused with jazz guitarist Johnny Smith though this could lead to him being confused with Jimmy Smith (musician), another Hammond great.