Many musical styles flourished and combined in the 1940s and 1950s, most likely because of the influence the radio had in creating a mass market for music. World War II caused great social upheaval, and the music of this period shows the effects of that upheaval.
Classic pop
Popular music, or "classic pop," dominated the charts for the first half of the 1950s. Vocal-driven classic pop replaced Big Band/Swing at the end of World War II, although it often used orchestras to back the vocalists. 1940s style Crooners vied with a new generation of big voiced singers, many drawing on Italian bel canto traditions. Mitch Miller, A&R man at the era's most successful label, Columbia Records, set the tone for the development of popular music well into the middle of decade. Miller integrated country, Western, rhythm & blues, and folk music into the musical mainstream, by having many of his label's biggest artists record them in a style that corresponded to Pop traditions. Miller often employed novel and ear-catching arrangements featuring classical instruments (whooping french horns, harpsichord), or sound effects (whip cracks). He approached each record as a miniature story, often "casting" the vocalist according to type. (Mitch) Miller and the producers who followed his model were creating a new sort of pop record. Instead of capturing the sound of live groups, they were making three-minute musicals, matching singers to songs in the same way that movie producers matched stars to film roles. As Miller told 'Time' magazine in 1951, 'Every singer has certain sounds he makes better than others. Frankie Laine is sweat and hard words - he's a guy beating the pillow, a purveyor of basic emotions. Guy Mitchell is better with happy-go-lucky songs; he's a virile young singer, gives people a vicarious lift. Rosemary Clooney is a barrelhouse dame, a hillbilly at heart.' It was a way of thinking perfectly suited to the new market in which vocalists were creating unique identities and hit songs were performed as television skits.

Whereas Big Band/Swing music placed the primary emphasis on the orchestration, post-war/early 1950s era Pop focused on the song's story and/or the emotion being expressed. By the early 1950s, emotional delivery had reached its apex in the miniature psycho-drama songs of writer-singer Johnnie Ray. Known as 'The Cry Guy' and 'The Prince of Wails,' Ray's on-stage emotion wrought 'breakdowns' provided a release for the pent-up angst of his predominantly teenaged fans. As Ray described it, "I make them feel, I exhaust them, I destroy them.' It was during this period that the fan hysteria, which began with Frank Sinatra during the Second World War, really began to take hold.

Although often ignored by musical historians, Pop music played a significant role in the development of Rock 'n' Roll as well:

[Mitch] Miller also conceived of the idea of the pop record 'sound' per se: not so much an arrangement or a tune, but an aural texture (usually replete with extramusical gimmicks) that could be created in the studio and then replicated in live performance, instead of the other way around. Miller was hardly a rock 'n' roller, yet without these ideas there could never have been rock 'n' roll. 'Mule Train', Miller's first major hit (for Frankie Laine) and the foundation of his career, set the pattern for virtually the entire first decade of rock. The similarities between it and, say, 'Leader of the Pack,' need hardly be outlined here.





