How did Disco change the music scene in the US?

Well, it nearly killed rock 'n' roll, but it did bring
dance back into the mainstream after a long absence. It also brought the smaller club
scene back into prominence, and disco was popular with ethnic groups--particularly
black, Hispanic and the burgeoning gay movement. It also became highly popular with
women who hit the clubs in much greater numbers. Disco also brought drugs into the clubs
and various forms of illegal stimulation nearly replaced alcohol as the top form of
imbibement in disco clubs. Disco also brought back orchestral instrumentation and richer
production values than had been seen in R&R. Although it orginated in Europe in
the early 1970s, disco took root in New York City and Philadelphia, and these first
gained prominence as the centers of this new sound. Disco proved to be the death knell
for several forms of rock music, and the rock genre never quite reached the levels of
popularity that it found in the late 1960s to
mid-1970s.

The disco genre itself eventually became a
cliche and a backlash, especially in America, ended its dominance during the 1980s,
although disco remained very popular in other parts of the world. The terms "dance
music" and "dance pop" eventually took its place. Other genres, particularly techno and
the art of remixes, were influenced by disco.