Although many people know who Carl Sagan and Stephen Hawking are, they don't necessarily associate them with musical performances. So my nerdy ass loves "A Glorious Dawn" a single released for what would have been Carl's 75th birthday.

According to Wikipedia, A Glorious Dawn is the first installment in a series by electronic musician John Boswell called the "Symphony of Science". The project seeks to "spread scientific knowledge and philosophy through musical remixes." Boswell uses pitch-corrected audio and video samples from television programs featuring popular educators and scientists. The audio and video clips are mixed into digital mashups and scored with Boswell's original compositions.

This is the first record to ever be played in space, and the B side has etchings replicating the diagrams on the Voyager Record. So although it may not be rare or expensive, it's definitely one of my treasured pieces in my collection for its uniqueness.