Conversation so far:
What big event happened in 1988 to make Testament so popular?
Was Testament a one member band?
Eric Peterson, Chuck Billy, Alex Skolnick, Gene Hoglan, and Steve Di Giorgio are the members of Testament.
Did Testament have more than one album?
Testament has twelve albums.

Question: Did they have an album that topped the music charts?
Self-contained rewrite: Did Testament have an album that topped the music charts?