The long-playing album or LP is introduced in 1948, along with the 45 RPM single in 1949, together they replace the predominant 78 RPM records.
Solid body electric guitars are introduced in the early 50's. These guitars designed for electric amplification would become the instruments of choice for rock guitarists.
The Rhythm & Blues (R&B) charts in the early 50's feature music made predominately by and for black Americans.
White pop artists begin covering R&B hit songs and turning them into hits on the Pop charts.
R&B artists begin to crossover to the U.S. Pop charts with hit singles.
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