Conversation so far:
What happened in 1981?
In January 1981, Styx released Paradise Theatre, a concept album that became their biggest hit, reaching No.
1.
What was a single off the album?
five singles, including the top ten hits "The Best of Times" by DeYoung (#3) and "Too Much Time on My Hands" by Shaw (#9).
Did they tour during this time?
CANNOTANSWER.
What is the backmasking accusation?
The band was accused by a California religious group and later the Parents Music Resource Center of backmasking Satanic messages.
What did the band say about the accusations?
James Young has denied this charge during his introduction for "Snowblind" when played live.

Question: What else did they do during this time?
Self-contained rewrite: Along with the release of Paradise Theatre what else did Styx do during 1981?