Scott Cameron managed the careers of blues greats Muddy Waters, Willie Dixon and others in the 1970s and 1980s in what should have been a boom time for the artists.
White rock bands — including the Rolling Stones, Led Zeppelin and the Doors — covered his clients' songs, and their vintage recordings were brought back on CDs. But the classic blues musicians had sold off the rights to the songs, sometimes under questionable circumstances.
"My clients made all these recordings — the foundations of modern music," Cameron told the Chicago Tribune in 1990, "and reaped none of the benefits."
Cameron, 76, who played a key role in winning back...