He used his accounting background in the early days of the music industry to find money owed to artists like Sam Cooke, whom he later managed. The pugnacious Klein began working with the Rolling Stones in 1965, though his own company wound up owning the rights to many early Stones songs such as “Satisfaction.” He worked with the Beatles just before their breakup and continued to represent John Lennon and George Harrison after that. (He’s pictured here with Lennon and John’s wife Yoko Ono.) Klein also produced the major charity concert for Bangladesh. By 1979 he was convicted of income tax fraud, says the New York Times and he spent two months in jail. But his Abkco company still owns the rights to original recordings of the Rolling Stones, Sam Cooke and other rock & roll pioneers.