Conversation so far:
What was Casbah Rock?
By 1977 the band were performing their own three-chord pop punk material, which was performed alongside cover versions at concerts, primarily at The Casbah.
When was their second concert at the Casbah?
The Casbah were the first performances for which the Undertones were paid on a regular basis.
Did they produce an album of any of their shows there?
This inspired the band to write and rehearse further material, as a means of remaining a popular act at this venue.

Question: What inspired the band to write and rehearse?
Self-contained rewrite: What inspired The Undertones to write and rehearse?