I caught the second of “In Your Ear Redux” concerts at Zankel Hall with The Tensions Mountain Boys Saturday night, and I was happy I did! 1. Chris Thile (mandolin, voice and composer) is clearly a masterful musician. His new group The Tensions Mountain Boys (Chris Eldridge, guitar/vocals; Greg Garrison, Bass; Noam Pikelny, Banjo; Gabe Witcher, violin (nee fiddle)/vocals; and Thile) is a perfect match. They all connect with astounding playing abilities and a certain nonchalance on stage. Thile was downright comedic in his delivery: “You’re all so kind to come here tonight, but why are you in your underwear?