Conversation so far:
what happened in 1976 to abba?
In March 1976, the band released the compilation album Greatest Hits.
what was it called?
Greatest Hits.
was it successful?
it became their first UK number-one album, and also took ABBA into the Top 50 on the US album charts for the first time.

Question: did they produce any other music?
Self-contained rewrite: Besides  the Greatest Hits album did ABBA produce any other music?