"In pushing past the accepted borders of soul music, it is possible that [Thom] Bell, [Isaac] Hayes, Gamble and Huff, and all the others were moved at least in part by their own upward mobility. It could also be that their fascination with sophisticated symphonic soul reflected what longtime R&B record producer Ahmet Ertegun characterized as African Americans' musical orientation towards the future—'what's next.' For these musicians, 'what's next' may have meant exploring the freedom to move beyond stultifying racial categorizations that consigned them to a particular kind of R&B—raw, straightforward, and unadorned. Stevie Wonder certainly made music that spoke to the dreams and disappointments of African Americans, and yet he categorically rejected the label 'black musician.' 'That's putting me in a particular box,' he insisted, 'and saying ... stay ... right ... where ... you ... are!' Over the years, Philly producers Kenneth Gamble and Leon Huff have positioned themselves differently when questioned about the 'blackness' of their music. In early 1973, Gamble argued that black artists no longer had to go through a 'whitening process' because the black market was now large enough to sustain them. (Certainly [Philadelphia International Records, Gamble and Huff's label] produced any number of socially relevant songs geared to black listeners.) He also said that he and his partner 'never thought along the lines of a black music thing,' and on yet other occasions that they thought 'green.' But the critical disparagement of PIR's sweet soul (mostly at the hands of white critics of rock music) infuriated the two producers. Huff went so far as to complain that these critics 'cannot really hear black music' and find it difficult 'respecting black cats without patronizing us.'"
—Alice Echols, Hot Stuff: Disco and the Remaking of American Culture, 2010 (pg. 25-26)