Larry Klein (born 1956) is a music producer, songwriter and bass guitar player, commonly known for being the frequent musical collaborator, and ex-husband, of Joni Mitchell.

He began his musical career while still in his teens, as a session musician, playing bass guitar on a string of albums, most notably several by jazz trumpeter Freddie Hubbard.

Klein met Mitchell when he was hired as a bassist and sound engineer for her 1982 album Wild Things Run Fast. The two quickly became romantically attached, and were married in November 1982. He helped produce that album, as well as her next four, occasionally contributing his own musical compositions to which Mitchell would add lyrics. It was during the recording of Turbulent Indigo, in 1994, that their marriage broke apart. He has continued to be involved, in various capacities, in the production of her albums.

Since his work with Mitchell, Klein has tended to produce albums by female singer–songwriters, although he was the co-producer (with Herbie Hancock) on Hancock's Grammy-winning River: The Joni Letters.

Don Was (born Don Fagenson; September 13, 1952) is an American musician, bassist and record producer.

Was was born in Detroit, Michigan. He graduated from Oak Park High School (Michigan) in the Detroit suburb of Oak Park, then attended the University of Michigan at Ann Arbor but dropped out after the first year. A journeyman musician, he grew up listening to the Detroit blues sound and the jazz music of John Coltrane and Miles Davis.

Using the stage name "Don Was", he formed the group Was (Not Was) with school friend David Weiss (David Was). The group found commercial success in the 1980s - releasing four albums and logging several hit records. A jazz/R&B album of Hank Williams covers, "Forever's A Long, Long Time" was released in 1996, under the name Orquestra Was. In 2008, Was (Not Was) reunited for an acclaimed new album and tour.

Don Was has earned his recognition as a record producer and has recorded with an array of artists from The Rolling Stones, Bonnie Raitt, Bob Dylan, John Mayer, Ziggy Marley, Bob Seger, Al Green, Lucinda Williams, Garth Brooks, Ringo Starr, Iggy Pop, Lyle Lovett, Kris Kristofferson, Joe Cocker, Hootie and The Blowfish, Amos Lee and Willie Nelson to Elton John, Stevie Nicks, George Clinton, Randy Newman, The Black Crowes, Carly Simon, Travis Tritt, Brian Wilson, Jackson Browne, The Barenaked Ladies, Old Crow Medicine Show, Roy Orbison, Waylon Jennings, Jessi Colter, Richie Sambora, The Presidents of the United States of America, B.B. King, Paul Westerberg, Kurt Elling, Poison, Cheb Khaled, The B-52's, Zucchero, Todd Snider, Elizabeth Cook, Jill Sobule and Solomon Burke. He has received multiple Grammy Awards including Producer of the Year in 1995. He produced several albums for Bonnie Raitt including her Nick of Time album that won the 1990 Grammy Award for Album of the Year.

Marcus Miller (born William Henry Marcus Miller Jr., June 14, 1959, Brooklyn, New York) is an American jazz composer, producer, and multi-instrumentalist. Miller is best known as a bassist, working with trumpeter Miles Davis, pianist Herbie Hancock, singer Luther Vandross, and saxophonist David Sanborn, as well as maintaining a prolific solo career. Miller is classically trained as a clarinetist and also plays keyboards, saxophone and guitar.

Miller was born in 1959 and raised in a musical family that includes his father, William Miller (a church organist and choir director) and jazz pianist Wynton Kelly. By 13, Marcus was proficient on clarinet, piano and bass guitar, and already writing songs. Two years later he was working regularly in New York City, eventually playing bass and writing music for jazz flautist Bobbi Humphrey and keyboardist Lonnie Liston Smith. Miller soon became a first call session musician, gracing well over 500 albums, a short list of which includes Michael Jackson, Herbie Hancock, Mariah Carey, Wayne Shorter, McCoy Tyner, Frank Sinatra, Dr. John, Aretha Franklin, Elton John, Grover Washington Jr., Donald Fagen, Bill Withers, Chaka Khan, LL Cool J, Me'shell Ndegé Ocello and Flavio Sala.

Frederick Dewayne "Freddie" Hubbard (April 7, 1938 – December 29, 2008) was an American jazz trumpeter. He was known primarily for playing in the bebop, hard bop and post bop styles from the early 1960s and on. His unmistakable and influential tone contributed to new perspectives for modern jazz and bebop.

Hubbard started playing the mellophone and trumpet in his school band at Arsenal Technical High School in Indianapolis, Indiana. Trumpeter Lee Katzman, former sideman with Stan Kenton, recommended that he begin studying at the Arthur Jordan Conservatory of Music (now the Jordan College of Fine Art at Butler University) with Max Woodbury, the principal trumpeter of the Indianapolis Symphony Orchestra. In his teens Hubbard worked locally with brothers Wes and Monk Montgomery and worked with bassist Larry Ridley and saxophonist James Spaulding. In 1958, at the age of 20, he moved to New York, and began playing with some of the best jazz players of the era, including Philly Joe Jones, Sonny Rollins, Slide Hampton, Eric Dolphy, J. J. Johnson, and Quincy Jones. In June 1960 Hubbard made his first record as a leader, Open Sesame, with saxophonist Tina Brooks, pianist McCoy Tyner, bassist Sam Jones, and drummer Clifford Jarvis.

Joni Mitchell, CC (born Roberta Joan Anderson; November 7, 1943) is a Canadian musician, singer songwriter, and painter. Mitchell began singing in small nightclubs in Saskatchewan and Western Canada and then busking in the streets and dives of Toronto. In 1965 she moved to the United States and, touring constantly, began to be recognized when her original songs ("Urge for Going," "Chelsea Morning," "Both Sides, Now," "The Circle Game") were covered by notable folk singers, allowing her to sign with Reprise Records and record her own debut album in 1968. Settling in Southern California, Mitchell and her popular songs like "Big Yellow Taxi" and "Woodstock" helped define an era and a generation. Her more starkly personal 1971 recording Blue has been called one of the best albums ever made. Musically restless, Mitchell switched labels and began moving toward jazz rhythms by way of lush pop textures on 1974's Court and Spark, her best-selling LP, featuring her radio hits "Help Me" and "Free Man in Paris."