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Acoustic sewer inspection technology emitting test tones through manholes created the mysterious musical sound Salt Lake City residents reported hearing downtown at night.

SALT LAKE CITY People living in downtown Salt Lake City have reported hearing music amid the construction.

Musician Rosemary Olsen lives downtown, one block east of State Street. She said she heard a B augmented chord repeatedly outside of her window.

“Just really kind of eerie, but it was beautiful,” Olsen said.