Music industry in the first half of the 20th century

Before rock and roll, American pop treated the song as the product. Writers and performers were separate jobs; hit status lived in the tune more than in one canonical recording.

Treat ~1955 as a convenient “year zero,” not a sacred date. Most historians describe rock as a hybrid of three pre-1955 markets: Mainstream Pop, Country & Western, and Rhythm & Blues. They differed in sound and audience—middle-class white pop buyers, urban Black R&B listeners, rural Southern white C&W listeners—so the industries stayed separate. We walk them in that order.

Mainstream Pop ran on publishers: hire writers, issue songs, push them to radio, and—above all—sell sheet music. From the late 19th century through the early 20th, parlor pianos made home performance normal; stores kept pianos and demonstrators so buyers could hear a chart before purchasing the chart. Records mattered more from the 1930s–40s (you finally heard Bing Crosby or Judy Garland as specific voices), but sheet music remained the core commodity. Rock performance did not live on sheet music the same way; that helped it crack the old market.

Songwriter ≠ performer. Gershwin, Porter, and the American Songbook tradition prove you could write without cutting your own hits. Performers stamped style onto shared repertoire—Sinatra, Elvis, or Liza Minnelli could each own *New York, New York* without writing it. Covers already existed; the word only got sharp later, when stars sold authorship as identity. Mid-1960s singer-songwriters reverse the older division of labor.

Bottom line for this lesson: the song is the unit. Next: how songs reach ears.