(Preble County, OH)--A former Preble County band teacher has learned his sentence for sexually abusing a 17-year-old student.  Garrett Stringer-Smith has been sentenced to 13 years in prison, followed by five years of parole.  He’s also been classified as a Tier III sex offender and will have to register for the rest of his life.  Stringer-Smith was a band teacher at Twin Valley Community Schools.  He was arrested last February after the student reported the relationship to a school resource officer.