p. 78 "The cultural data of phonograph records was importantly a matter of representation....In many respects it was their physical quality as standardized, mass-produced goods taht helped to enforce their quality as specific cultural data, even as the culture they representd proved variable and unspecific in the extreme....What I am suggesting is that phonograph records frequently proved transgressive of the very cultural categories that they helped to represent as distinct or specific."

on "ethnic" records see Lizbeth Cohen (1990, 105), Victor Greene (1992) 

Cited by Susan McClary in OHWM review.

Excellent chapter 4 (pp. 63-88) Derek Vaillant, "Your Voice Cam in Last Night....but I thought it Sounded a Little Scared": Rural Radio Listening and "Talking Back" during the Progressive Era in Wisconisn, 1920-1932.  University-run radio station wanted to program classical music, farmers (for whom the station was largely for) wanted to hear their (fiddler) music.