Chris Jasper, a former member of the Isley Brothers who helped the group shape its flamboyant funk-rock sound, has died. The singer-songwriter died Sunday at age 73, his family announced Monday on Facebook,

He helped shape 1970s hits including “For the Love of You” and “Fight the Power.” Later he sang lead on “Caravan of Love,” which reached No. 1 on the R&B chart.

Chris Jasper, who helped bring the slow-grooving Isley Brothers into an upbeat electronic era, died Sunday at 73.