Kacey Musgraves joins Dierks Bentley at ACL Live. 2015 photo by Erika Rich for American-Statesman

Dierks Bentley, Kacey Musgraves at ACL Live. Finding quality music on mainstream country radio can be a tough task, but the annual Mack, Jack & McConaughey fundraiser nabbed two bright lights for its gala event. Bentley was the best thing about last year’s iHeartCountry show at the Erwin Center, and Musgraves has become a frequent visitor to Austin in part because of her friendship and collaboration with Willie Nelson. At $99-$139, the price is high, but the cause is good: Proceeds benefit programs dedicated to empowering children, including the Dell Children’s Medical Center of Central Texas, CureDuchenne, HeartGift, the Just Keep Livin’ Foundation and the Rise School of Austin. 9 p.m. 310 Willie Nelson Blvd. acl-live.com.

Also: The Old Settler’s Music Festival in Driftwood doesn’t hit full swing until the weekend, but early birds can catch Della Mae, the HillBenders and more starting at 4 p.m. at Camp Ben McCulloch. … Noted acoustic blues guitarist John Hammond visits One World Theatre. … Atlanta indie-rockers Deerhunter support their new 4AD release “Fading Frontier” outdoors at the Mohawk with Bitchin Bajas, with Brooklyn band Acid Dad on the club’s indoor stage. … Durham, N.C., sibling pop group Delta Rae visits the Parish. … Local band Taylor & the Wild Now plays an EP release show indoors at Stubb’s.