Bowie collaborator Brian

ENO

This ambient music pioneer also produced albums for Talking Heads and U2, known for his experimental studio techniques.

This clue refers to Brian Eno, the influential musician and producer who frequently worked with David Bowie. He co-wrote and produced key Bowie albums like "Heroes" and Low during the late 1970s. The answer is simply his last name, "ENO," which fits neatly into the crossword grid. If you know Bowie’s Berlin-era collaborators, this one’s straightforward.