NASA astronauts aboard the International Space Station after Dragon capsule successfully docks

It's a NASA tradition that stretches back decades: astronauts waking to tunes piped up from the ground. The tradition began in 1965, when the wake-up song was "Hello Dolly" by Jack Jones during Gemini 6, and continued during the Apollo program "when astronauts returning from the Moon were serenaded by their colleagues in mission control with lyrics from popular songs that seemed appropriate to the occasion," according to a history of NASA wake-up music compiled by Colin Fries, a NASA historian. "Several crews have awakened on their final day in space to Dean Martin's popular song'Going Back to Houston,'" Fries wrote.