My secret santa must've discovered my absolute love for astronomy. These CDs are the Symphonies of the Planets, a recording from Voyager's travels through the cosmos:

"The 5 volumes of recordings are created from original Voyager recordings using the instruments on the probes to translate the vibrations come from different sources such as planetary magnetosphere, radio waves bouncing off the planets, interplanetary magnetic fields."

This is actually not trivial to come by these days, so it's a great gift. Can't wait to listen!!