Justin Townes Earle performs at Rachael Ray’s party at Stubb’s during SXSW on Saturday March 20, 2010. Photo by Jay Janner/American-Statesman

Hard-core Troubadours Galore. Steve Earle has a song about “the last of the hard-core troubadours,” but a survey of this night’s offerings in town suggests the calling still has plenty of representatives — his son included. Catch Justin Townes Earle, on tour behind his new disc “Single Mothers,” at Emo’s with Cory Branan ($20, 8 p.m. doors). ACL Live has a sold-out show by perhaps the archetypal hard-core troubadour, Merle Haggard, with Marty Stuart opening (8 p.m.) Also sold out is a solo acoustic performance by Ryan Bingham, who Rolling Stone once claimed “sings like Steve Earle’s dad,” at Holy Mountain (8 p.m.). Cactus Cafe presents true-to-life troubadour Tim Easton, whose rambles have taken him from Ohio to Alaska to the California desert to Nashville ($12-$15, 8:30 p.m.). High-profile locals get in on the action too, with Gurf Morlix turning up at the Continental Club ($10, 8:30 p.m.) and Monte Warden welcoming Chip Kinman of Rank & File to the Saxon Pub for his new “ATX All Access” web TV show ($10, 8:30 p.m.).

Also: Not actually Brazilian electro punk outfit Brazilian Girls throws down dance floor bangers at Empire Control Room. … Hotel Vegas hosts San Francisco psych rockers Thee Oh Sees on a bill that also includes excellent locals A Giant Dog and Hundred Visions. … If we’ve said it once, we’ve said it a thousand times: We Were Promised Jetpacks! The Scottish indie band which wisely took that name plays the outdoor stage at the Mohawk with Twilight Sad.