Willie Nelson made a surprise guest appearance during one of his son’s shows in Austin, TX on Tuesday night. The country/folk legend joined Lukas Nelson and Promise of the Real at Arlyn Studios during the Roc Nation at Raptor House Late Night Concert Series. The set included renditions of “Mammas Don’t Let Your Babies Grow Up To Be Cowboys” and Hank Williams’ “Hey Good Lookin’.” Lukas Nelson and Promise of the Real will be performing a few times in Austin this week for the SXSW Festival. You can watch Willie and Lukas’ full performance above.