Thin White Rope and Green on Red may have been some of the early artists in what became known as "alt-country," but Uncle Tupelo took that style to much greater prominence. Along with his friend Jay Farrar, Tweedy led that band for seven years before the former left to form Son Volt and the latter left — along with the rest of Uncle Tupelo — to form Wilco. Tweedy's literate, thoughtful and deeply observational lyrics and gently soulful voice have influenced an entire generation of songwriters. He's also been instrumental in furthering the alloy of country and contemporary rock, especially with the inclusion of experimental guitar wizard Nels Cline in Wilco. This Boulder Theater show offers a rare chance to catch an intimate solo performance in an appropriate setting.