This cache series is all about recognizing unconventional units of measure and converting between them and more standard units.
The unit of measure this cache focuses on is the Free Bird Play, or FBP. One FBP is equal to the amount of time it takes to play through the original album version of Lynyrd Skynyrd's rock anthem "Free Bird", which for the purposes of this cache equates to 9 minutes and 8 seconds. You can access the puzzle here:
Unconventional Units - Free Bird Play
The link under the FBP section will take you to a page where you must answer a simple trivia question about the song "Free Bird", then perform some conversions between FBPs and traditional time units in order to obtain the final coordinates.
You can see a list of all the caches in this series here:
Unconventional Units Start Page
BYOP, and happy hunting!