Besides, most Tin Pan Alley songs were written in 32-bar AABA form; "The Way You Look Tonight" by Jerome Kern; "Night and Day" by Cole Porter; "The Man I Love" by George and Ira Gershwin were all the songs with AABA forms. Because Tin Pan Alley songs were mostly simple, memorable, and emotionally, it was appealing to sell to large audiences and became the mainstream without doubt.
However, in the early 1950s, a "new" kind of music which was later called rock and roll came to the stage and thought as an anomaly of music comparing to Tin Pan Alley. On the other hand, World War II put an end to the Great Depression. After the war, the economy continued to boom. Economic growth meant more disposable income. Much of it was spent on entertainment. Therefore, prosperity trickled down to a newly enfranchised segment of society, the teenager. Teens defined themselves socially ("generation gap" became part of everyday speech), economically (they put their money where their taste was), and musically (many had a taste for rock and roll). Also, in the fifties, entertainment media went through their most dramatic and tumultuous period of change since the twenties. The rise of television, its impact on the film industry and radio, improvements in recording technology, and the development of new musical instruments all had an impact on rock era music. Elvis Presley acted as not only an icon of that era but also a leader of rock and roll. He gave the music its most memorable voice, its most indelible image, and its strongest commercial presence. His unique blending of white country and gospel music, black R&B and gospel, white pop music, his particular brand of charisma and talent, and the resulting success and controversy helped him greatly to begin, without premeditation. Though Elvis was king of rock and roll, he sang very little rock and roll. Most of his early medium and up-tempo songs like "Good Rocking Tonight", "Heartbreak Hotel" and "All Shook Up" use either the shuffle beat of rhythm and blues, or a souped-up two-beat rhythm which could be reflected from songs like "That's All Right" and "Mystery Train".
