Conversation so far:
What did The Wallflowers try in 2001?
In 2001, Jakob Dylan began writing for the Wallflowers' fourth album.
What was The Wallflowers's album called?
Red Letter Days
What did The Wallflowers's try next?
In July 2004, the Wallflowers returned to the studio to record their fifth album, Rebel, Sweetheart.
Who did The Wallflowers help?

Question: What else did they try
Self-contained rewrite: What else did The Wallflowers try?