Conversation so far:
what soundtracks did Mogwai make?
In 2006, the band provided the soundtrack to the film Zidane: A 21st Century Portrait.
how was it received by critics?
CANNOTANSWER.
any other soundtracks?
The band also collaborated with Clint Mansell and Kronos Quartet on the soundtrack to The Fountain in 2006.
Where there any other soundtracks after those?
Mogwai are also featured in the 2009 post-rock documentary Introspective.
The band donated an exclusive track to the PEACE project in April 2010 in support of Amnesty International.

Question: what track did they donate?
Self-contained rewrite: What track did Mogwai donate?