John Koerner has been played on NTS shows including All Fruits Ripe w/ Jack Sapsed, with Red Palace first played on 27 March 2023.

"Spider" John Koerner (born in Rochester, New York, on 31 August 1938, ; died 18 May 2024) was an American guitarist, singer, and songwrite remembered as a guitarist and vocalist for the blues trio Koerner, Ray & Glover (that included Dave Ray and Tony Glover) and for his albums as a solo performer and with collaborator Willie Murphy ("Spider" John Koerner & Willie Murphy).

Koerner grew up in Rochester, New York, and after a brief military service attended the University of Minnesota. He intended to major in engineering, but soon became involved in the local music scene where he met Dave Ray and Tony Glover. They formed a loose-knit trio, releasing albums under the name Koerner, Ray & Glover. The group gained notoriety with Blues, Rags and Hollers originally released by Audiophile in 1963 and then re-released by Elektra Records. Koerner was an early influence on Bob Dylan and is mentioned in his autobiography Chronicles. Of that time period, Koerner later said, "We were all goofy, you know. We were thinkers and drinkers and artists and players, and Dylan was one of us. He was another guy."

In 1965, Koerner recorded his first solo album, Spider Blues, for Elektra and appeared at the Newport Folk Festival accompanied by Glover. He continued playing on the folk circuit and joined with Willie Murphy to record Running, Jumping, Standing Still in 1969. The duo eventually split up and Koerner pursued an unsuccessful career in film-making, retiring from music and moving to Copenhagen, Denmark. He later returned to music in the traditional folk music genre and continued to perform and release new albums from time to time.

In 1983 the Minnesota Music Academy named Koerner, Ray and Glover "Best Folk Group" and in 1985 inducted them into the MMA Hall of Fame. In 2008, Koerner, Ray & Glover were inducted into the Minnesota Blues Hall of Fame under the category Blues Recordings for their 1963 album "Blues, Rags and Hollers".