Conversation so far:
When was ZZ Top formed?
The original line-up was formed in Houston and consisted of Gibbons, organist Lanier Greig (died February 2013) and drummer Dan Mitchell.
What band members changed later on?
", Greig was replaced by bassist Billy Ethridge.

Question: What music did they release with him?
Self-contained rewrite: What music did ZZ Top release after Lanier Greig was replaced by Billy Ethridge?