Chris Stapleton headlined both Friday nights of this year's Austin City Limits Festival in Austin, Texas. See his October 4 set here.

While performing at Austin City Limits, Chris Stapleton welcomed Willie Nelson to the stage for special performance.

Chris Stapleton brought out surprise guest Willie Nelson — the artist responsible in part for putting Austin City Limits on the map — during his Friday night headlining set at the ACL Festival.

Willie Nelson made a surprise appearance, performing with Chris Stapleton at the Austin City Limits Music Festival.

On Friday, Willie Nelson joined Chris Stapleton on the stage at Austin City Limits Music Festival. Nelson was not listed as ...