Conversation so far:
What soundtracks did the band Mogwai make?
Mogwai's song Auto Rock was used in Michael Mann's 2006 film Miami Vice.
How was Miami Vice received by critics?
On the film-review aggregator Rotten Tomatoes, Miami Vice holds a 46% critics rating.
Any other soundtracks that Mogwai worked on, besides the one for Miami Vice?
Mogwai collaborated with Clint Mansell and Kronos Quartet on the soundtrack to The Fountain.
Were there any other soundtracks that Mogwai contributed to after Miami Vice and The Fountain?
Mogwai are also featured in the 2009 post-rock documentary Introspective.

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