Marvin Isley, whose muscular bass lines propelled the hits of his classic sibling band The Isley Brothers, died Monday in Chicago at age 56.

The cause of death has not yet been announced, though Isley suffered from diabetes severe enough to have caused him to leave the band in 1997. Later, his condition led to the amputation of both legs.

Isley will be remembered for the resilience and power of his bass work, which, for one thing, formed a crucial hook in the undulating ’70s hit “Fight The Power.” The bassist also played on the smash “Who’s That Lady,” as well as on prominent songs like “For The Love Of You” and “Harvest For The World.”

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