These appear to be notes taken from a college lecture and contain considerable information on the Baroque period of music.

This entry from Encyclopedia Britannica features the Platters, an American vocal ensemble, one of the foremost singing groups of the early days of rock and roll and also often associated with the doo-wop style.

Biographical details on Sam and Dave, the American vocal duo who were among the most popular performers of soul music in the late 1960s and whose gritty, gospel-drenched style typified the Memphis Sound.