By Denny Dyroff, Staff Writer, The Times Phoebe Legere, who will headline a show on August 4 at The Steel City Coffee House (203 Bridge Street, Phoenixville, 610-933-4043, www.steelcitycoffeehouse.com), is a talented singer, songwriter, instrumentalist — a multi-talented artist who is like no other. The descriptive word “unique” is often misused – frequently as an unsubstantiated hyperbole....