Interesting little piece, I would imagine it would do one of several things.
My first thought was that it'd allow Doug to follow a checklist of arbitrary length and complete it when the song ends. Even if the checklist normally takes hours or days. It does not guarantee however that the checklist has everything marked as good/functional/ready to go, it only tells him what the checklist would normally tell him and take the actions necessary to run through the entire checklist.
Another option was that it'd allow Doug to run through the checklist for a space or aircraft and by magic force it to be ready for use as the song (and checklist) ends. For probably obvious reasons I would expect this to be rather expensive, and get even more so as the craft increases in size/capacity/etc.
A third option is that it's a Summon Lunar Lander or Summon Mission Control effect. Which is mostly useless, but still.