1. Why does Disco appeal to more groups of people, then Rock and Roll which appeals to mostly men?


Disco appeals to more groups of people because it was liked by a wider range of cultural groups such as gays, blacks, and Latins. It became popular through different channels than that of Rock and Roll such as urban dance clubs, disk jockeys, and fan magazines. 


2) Which type of music (rock/disco) is most like today's popular music?


Today's popular music is most closely related to Disco. The rising "house music" scene derives from the same beats and rhythm that originated in Disco. Today, the top charting hits have more elements of the 'dancey' disco than that of rock and roll.