Puzzle #339 - A Song Reference (Greener Grasses)

chaotic_iak hosted a logic showcase for Greener Grasses, a type I don't really understand how to construct. Naturally, I tried to enter anyway. It didn't go very well- even with the attempted theming on the (infamous?) song that appeared in a Rock Band game.

This puzzle uses regions of size 3.

puzz.link interface      penpa interface