Conversation so far:
When did Dan Brown become a songwriter?
In 1991 Dan Brown moved to Hollywood to pursue a career as singer-songwriter and pianist.
What was Dan Brown's first published song?
After graduating from Amherst, Dan Brown dabbled with a musical career, creating effects with a synthesizer, and self-producing a children's cassette entitled SynthAnimals
Was Dan Brown's first cassette SynthAnimals successful?
Dan Brown sold a few hundred copies of SynthAninals.

Question: What did he write next?
Self-contained rewrite: What did Dan Brown write next after SynthAnimals?