The Barr Brothers made their network TV debut last night on The Late Show with David Letterman. Barr Brothers co-founders Brad and Andrew Barr have not performed on the late night TV circuit since 2007 when The Slip performed on Late Night with Conan O’ Brien. Letterman introduced the Canadian-based group last night and The Barr Brothers delivered a stellar performance of “Beggar In The Morning.” A clip of the performance is now available over on Relix.com.