Heather Strachan will lead the 30-member Piedmont Conservatory Strings orchestra in performing works by six living composers, including Eric Whitacre and Karl Jenkins, in a concert set for 7:30 p.m. on Tuesday, Nov. 2. Strachan is the director of the Piedmont Conservatory Strings, Artist-in-Residence at the Piedmont University Conservatory of Music, and a founding member of…