A new documentary about Austin City Limits by filmmaker Keith Maitland, A Song for You: The Austin City Limits Story, features footage of and interviews with many beloved artists, including Sturgill Simpson. In the above video clip, premiering exclusively on The Boot, Simpson reflects on the enormity of playing on that stage in 2015.

"You spend your whole life watching your heroes, and then somebody says, 'Oh you're gonna go play Austin City Limits,'" Simpson says. "I haven't really comprehended that yet."

He adds, "You think about all the people that have stood on that stage ... you'll probably have a nervous breakdown."

A Song for You: The Austin City Limits Story offers viewers the ultimate backstage pass to the 40 years of history of the long-running television music series, which has grown from a local showcase to an all-encompassing parade of superstars and up-and-comers from many different genres. The film features interviews with many music legends -- everyone from Willie Nelson to Wilco, Ray Charles to Radiohead, the Avett Brothers to Dale Watson and more -- and celebrated its world premiere during SXSW 2016 this year; it also screened at the Nashville Film Festival.

Maitland's movie is halfway through a month-long Kickstarter campaign and, as of publish time, has raised a little over $42,000 of its $125,000 goal. Incentives for the campaign include an opportunity to play the infamous Studio 6A piano, a chance to sign the ACL Graffiti Wall and pieces of ACL's original wooden stage.

Simpson's new album, A Sailor’s Guide to Earthdebuted at No. 1 on the Billboard Country Albums chart and at No. 3 on the all-genre Billboard 200. The ACL Music Festival, which is celebrating its 15th anniversary in 2016, is scheduled for Sept. 30-Oct. 2 and Oct. 7-9.