Conversation so far:
What was his involvement with Kate Bush?
Gilmour was responsible for bringing Kate Bush to public attention.
How did he bring her to public attention?
her family produced a demo tape with over 50 of her compositions, which was turned down by record labels.
Gilmour received a copy of the demo from Ricky Hopper.

Question: What was his reaction to the demo?
Self-contained rewrite: What was David Gilmour's reaction to Kate Bush's demo?