The Funk Brothers were the brilliant but anonymous studio band responsible for the instrumental backing on countless Motown records from 1959 up to the company's move to Los Angeles in 1972. Woefully underappreciated as architects of the fabled "Motown sound," the individual musicians were rarely credited on the records that relied upon their performances, which downplayed their importance to the label. Motown's sophisticated, urbane brand of R&B certainly would have been difficult to achieve without the extensive jazz training that many of the Funk Brothers brought to the table. In order to keep that sound a distinctive brand name, Motown signed most of the group to exclusive, highly restrictive contracts during their tenure, although a few peripheral members were able to moonlight on sessions for other companies from time to time. In more recent years, the Funk Brothers' legacy has begun to receive proper attention, most notably in Allen Slutsky's 1989 book Standing in the Shadows of Motown, which focused on bass genius James Jamerson, and the 2002 documentary film of the same name, which covered the group as a whole.