By Denny Dyroff, Staff Writer, The Times Mary Fahl When Mary Fahl performs in concert, there are three possible avenues she might travel. She could take the stage with her band. She could perform a solo show. Or, she could treat her fans to a live presentation of one of her special projects. On November 4, Fahl will return to the area for a show at Arden Gild Hall (The Highway, Arden, Delaware, ardenconcerts.com)...