Apollo 13 Flight Director's Loop:
http://www.youtube.com/watch?v=KWfnY9cRXO4 (Part 1)
There are three more Audio loops in the set, each lasting about 1 hour and 30 minutes. They are fascinating to hear; Gene Kranz' growing surprise as Odyssey quickly loses power, and the realization that the Mission is in jeopardy.
Then, as Glynn Lunney takes over, you get drawn in as the COM starts to cut out, then is lost. Then comes the realization that Apollo 13 has to get back on a Free Return trajectory, before they can do anything else.
You hear the tension as Jack Swigert, Fred Haise and Jim Lovell try to transfer the Guidance information from the CSM to the LEM. The tension grows as Fred and Jim try to complete the 3 hour LEM Activation in one (1) hour, before they can do the Mid Course Correction for Free Return. Everything's being done on the fly, and literally by the seat of their pants.
You know the rest of the story...