Also: The Darkness, Froth and Ryan Beaver on local stages By Denny Dyroff, Staff Writer, The Times Canadian singer-songwriter Loreena McKennitt is doing a pair of shows in the Delaware Valley this week. On first listen, Canadian singer-songwriter Loreena McKennitt might sound like just another folk artist with a nice voice and a Celtic vibe. But, listen more and you’ll find a talented singer whose...