Sure, there's an element of spontaneity to the tradition of Celtic fiddlers, pipers, guitarists and other musicians meeting to play live music, but it's far from casual. Traditionally, the Irish session has stood as a connection to a musical tradition that spans centuries. The players stick to a very specific set of tunes, whether they're ballads, jigs, reels, hornpipes or polkas. A musician's chops have to be consummate -- there's not piddling around on a serious jig played in a breakneck tempo. The Irish session is a tradition unto itself, and it's alive and well in several Celtic bars in the Denver metro area. If you've got faith in your skills as a player, you're welcome to show up and try your luck. As we prep to casually become Irish for a weekend of drinking and abandon, we've rounded the top five local sessions that are liable to connect a Coloradan to the storied musical ritual of the Irish session.