Disco started falling out of favor in the early 1980s.
Yes, disco became old school
Do uo I don't know what you mean, but there were several major trends and events in 1980s popular music. What kinds of trends were there? Well, the 1980s saw emergence of dance music and new wave. I like those. What else happened then?
As disco fell out of fashion in the decade's early years, genres such as post-disco, Italo disco, Euro disco and dance-pop became more popular.