Conversation so far:
When was ZZ Top formed?
ZZ Top is an American rock band formed in 1969 in Houston, Texas.
What ZZ Top members changed later on?
Lanier Greig was replaced by bassist Billy Ethridge, a bandmate of Stevie Ray Vaughan, and Dan Mitchell was replaced by Frank Beard of the American Blues.
What music did ZZ Top release with Greig?
ZZ Top released their first single, Salt Lick.

Question: When was Salt Lick released?
Self-contained rewrite: When was Salt Lick by ZZ Top released?