An engineer out here who I assisted until he passed worked with chick corea for a long time and was the chief engineer at his studio mad hatter.
Jerry always told this story to the new staff as a way to say prepair for anything and everything.
One day after mixing a project at mad hatter, dude is getting ready to go when chick shows up and starts to play piano in his office. He is joined by John McLaughlin shortly after who showed up to the studio with an acoustic guitar.
Well he couldn’t just leave, so he casually walks past them to the mic locker and grabs some mics and cables. He sets up a stereo pair just to capture and proceeds to record the duo having a jam using a 2-trk 1/4”. This lasts for hours and the entire time dude is just going from one 2trk to the other and back as tape runs out. When they finally leave in the wee hours of the morning dude packs up the 2trks and goes home. He gets a phone call from chick later that day asking if any of that got recorded because they had some good moments.