Conversation so far:
What is Mwng?
a largely acoustic album of Welsh language songs entitled Mwng.
What are some of the songs on Mwng?
CANNOTANSWER.
When did mwng come out?
Mwng in May 2000.
When did Guerrilla come out?
January 2000.

Question: Who worked on Guerrilla?
Self-contained rewrite: Who worked on songs on Guerrilla?