Roots of Earth, Wind & Fire

Donny Edward Hathaway was an American soul singer, keyboardist, songwriter, backing vocalist, and arranger who Rolling Stone described as a "soul legend". His most popular songs include "The Ghetto", "This Christmas", "Someday We'll All Be Free", and "Little Ghetto Boy". Hathaway is also renowned for his renditions of "A Song for You", "For All We Know", "Jealous Guy" and "I Love You More Than You'll Ever Know", along with "Where Is the Love" and "The Closer I Get to You", two of many collaborations with Roberta Flack. He has been inducted into the St. Louis Walk of Fame and won one Grammy Award from four nominations. Hathaway was also posthumously honored with a Grammy Lifetime Achievement Award in 2019. Dutch director David Kleijwegt made a documentary called Mister Soul – A Story About Donny Hathaway, which premiered at the International Film Festival Rotterdam on January 28, 2020.

Blood, Sweat & Tears is an American jazz rock music group founded in New York City in 1967, noted for combining a brass section with rock band instrumentation. BS&T has gone through numerous iterations with varying personnel and has encompassed a wide range of musical styles. Their sound has merged rock, pop and R&B/soul music with big band jazz.

War is an American funk/soul/rock band from Long Beach, California, formed in 1969.

The Dells were an American R&B vocal group. Formed in high school in 1953 by founding members Marvin Junior, Verne Allison, Johnny Funches, Chuck Barksdale, and Michael and Lucius McGill, under the name the El-Rays. They released their first recording in 1954 and two years later had their first R&B hit with "Oh What a Night". After disbanding due to a near-fatal car crash in 1958, the band re-formed in 1960 with Funches being replaced by Johnny Carter. This lineup remained together until Carter's death in 2009. In 2004 the Dells were inducted into both the Rock and Roll Hall of Fame and the Vocal Group Hall of Fame. The group performed until illness forced longtime lead singer Marvin Junior and bass vocalist Chuck Barksdale into retirement, ending the group's 60-year run.

Rotary Connection was an American psychedelic soul band, formed in Chicago in 1966.