Chris Jasper, a former member of the Isley Brothers who helped define their classic sound, died at the age of 73. Jasper’s family announced his death on social media, stating that he passed away on Feb.

From a pop diva to a jam band, the nominees for this year’s Rock & Roll Hall of Fame were announced Wednesday.

Jasper was an R&B singer-songwriter and producer credited with shaping the sound of the Isley Brothers in the ‘70s and ’80s. He, along with Ernie and Marvin Isley, transformed the vocal trio (originally known for ‘50s and ’60s hits like “Shout” and “This Old Heart of Mine”) into a six-member R&B/funk group in 1973.