Here’s a father-and-son bill that could teach you about the fun to be had at the outer reaches of Nashville and country music. Back in 1958, Bobby Bare cut a song he had co-written, “The All-American Boy,” as a demo for his friend Bill Parsons, and Bare’s recording — released under Parsons’ name — hit the charts. During the ’60s, Bare released such first-rate singles as “Shame on Me” and the indelible “The Streets of Baltimore,” and made his Nashville-outlaw statement with 1975’s great Cowboys and Daddys. Bobby Bare Jr. has gained fame as a Nashville rocker who has described a post-Shel Silverstein universe — check out the 2004 From the End of Your Leash, recorded with Bare Jr.’s Young Criminals’ Starvation League. Earlier this year, Bare Jr. released a version of “Shame on Me,” and tonight’s show should feature cross-generational interplay and savvy songcraft.