Authorities in Washington say a former Tacoma Community College music instructor tricked a teenage voice student to take off her clothes off while singing in hopes she would reach lower octaves.

The Tacoma News Tribune reports ( http://is.gd/oF4ieo) 37-year-old Kevin Gausepohl is charged with seven counts of communicating with a minor for immoral purposes and one count of obstructing a law enforcement officer.

Investigators say he told a Gig Harbor High School student he was conducting a study on how sexual arousal affects vocal ranges. The girl was 17 at the time. She was attending the school as part of the Running Start program that allows high schoolers to take college courses.

Other students told investigators they were also approached by Gausepohl, who resigned in October and denies the allegations.

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Information from: The News Tribune, http://www.thenewstribune.com