 "Rather than blast off with only blank cassettes, the astronauts took tapes that had been pre-filled with music befitting their tastes" and recorded over them as the mission advanced forward.Neil Armstrong, Buzz Aldrin, and several other astronauts were provided with cassette recordings by Al Bishop and Hollywood producer Mickey Kapp.The TC-50 has variously been described as a "predecessor" or "proto-Walkman" due to its compact design and similarity.