NEW YORK (AFP) - Dennis "Dee Tee" Thomas, a co-founder of the legendary soul-funk band Kool & The Gang, whose hits included Celebration, died on Saturday (Aug 7) at age 70, the group announced.

Thomas, "beloved husband, father and a co-founder of Kool & The Gang, passed away peacefully in his sleep at the age of 70 in New Jersey," said a Facebook statement from the group.

Another founding member, Ronald Bell, died last year.

"An original member of Kool & The Gang, Dennis was known as the quintessential cool cat in the group, loved for his hip clothes and hats, and his laid-back demeanour," his bandmates wrote.

"Alto saxophone player, flutist, percussionist as well as master of ceremonies at the band's shows," he made his farewell appearance with the group on July 4 at the Hollywood Bowl in Los Angeles, the statement added.

Kool & The Gang became a major smash in the 1970s, pumping out hits like Get down On It, Jungle Boogie and Ladies' Night, with its brassy funk putting it in a class with Earth, Wind & Fire, the Isley Brothers and Sly And The Family Stone.

Brothers Robert and Ronald Bell, along with friends Thomas, Robert Mickens, Charles Smith, George Brown and Ricky Westfield founded the group in 1964 in New Jersey, first under the name the Jazziacs.

The long-running group fused jazz, soul and funk.

Thomas was the group's stylist, the statement said, making sure they "always looked fresh".

"In the band's early days, Dennis also served as the 'budget hawk,' carrying the group's earnings in a paper bag in the bell of his horn."

Kool & The Gang was inducted into the Songwriters Hall of Fame in 2018.

It remains a DJ favourite and is heavily sampled especially in the rap world, its tracks appearing in songs by artistes including Jay-Z, Nas, NWA, Tupac, The Wu-Tang Clan, Snoop Dogg, A Tribe Called Quest and Busta Rhymes.