Scott Cameron, 76, who managed the careers of blues greats Muddy Waters, Willie Dixon, and others in the 1970s and 1980s and played a key role in winning back ownership rights and royalties for blues performers, died Feb. 19 in a Springfield, Mo., hospice facility.

The cause was lung cancer, said his daughter, Manda Cameron-Hussain.

One of Mr. Cameron's moves was against members of Led Zeppelin, who recorded two Dixon numbers on its 1969 debut album, crediting the songwriter. But the follow-up album the same year included one of the group's biggest hits, "Whole Lotta Love," credited to members of the band. A lawsuit accusing the band of copyright infringement was settled out of court.

Later agreements were reached on behalf of Dixon, Waters, Otis Rush and other artists signed to the pivotal Chess Records blues label, founded in 1950 in Chicago. - L.A. Times