Conversation so far:
What is A-Teens' The ABBA Generation?
A-Teens started the recording process of what would be their debut album, The ABBA Generation.
What music was on A-Teens's debut album The ABBA Generation?
The ABBA Generation consisted purely of ABBA covers reinterpreted with a modern pop and electronic flair.
When was A-Teens's debut album The ABBA Generation released?
The ABBA Generation was released on 25 August 1999.
Who worked with A-Teens to produce their debut album The ABBA Generation?
Was A-Teens's debut album The ABBA Generation sucessful?
A-Teens's first single, Mamma Mia, topped the charts in over ten countries including their home country Sweden where it stayed at number one for eight consecutive weeks.

Question: What did they do after the album was released?
Self-contained rewrite: What did A-Teens do after their album The ABBA Generation was released?