Newport Folk Festival programmers like to close their lineups on a note of uplift; to send fans to the exits feeling elated and moved. On that front, they couldn't have done much better than the great Mavis Staples, whose titanic career has spanned more than 60 years. From her time in the best-selling gospel family band The Staple Singers through her role in the civil rights movement, she's been a face of change and a voice behind some of the most powerful songs in modern history.

Trigger Hippy is a roots rock powerhouse formed in 2009, whose prominent members include guitarist 

  Jackie Greene and drummer Steve Gorman of The Black Crowes, along with longtime singer/songwriter Joan Osbourne. The band joins us for a live midday concert on Friday, August 1st. So far, Trigger Hippy has only released one self-titled EP - four songs of blistering, blues-infused rock and roll – along with a live album recorded at the 2012 Wanee Festival in Live Oak, Florida. But they have plans to release a new album soon later this year.

There aren't a whole lot of failures on the resume of Jeff Tweedy, who co-piloted the groundbreaking alt-country band Uncle Tupelo in the '80s and early '90s, then multiplied its popularity as the leader of Wilco. In that band, Tweedy's refusal to compromise his vision led to his greatest commercial success, vaulting idiosyncratic records like Yankee Hotel Foxtrot and A Ghost Is Born into the canon.

Far removed from his days as a white-knuckled teenage prodigy in Bright Eyes, Conor Oberst has settled into his 30s as a wise and wizened elder statesman. He's come to channel his youthful intensity into real showmanship, especially onstage, while continuing to mine powerful emotions and a sort of fearless poignancy in his songwriting.

The Newport Folk Festival sells out months before its lineup is announced, but fans aren't entirely in the dark: Most know there's at least a 50 percent chance that the lineup will include the countrified California roots-rock band Dawes. Led by brothers Taylor and Griffin Goldsmith, Dawes is a heartwarming crowd-pleaser, both on stage and on albums like last year's Stories Don't End.

The Sunday lineup of 2014's Newport Folk Festival will take thousands of fans to church, as it opens with the Berklee Gospel & Roots Choir and closes with the gospel and R&B titan Mavis Staples.

In the past, the Berklee Gospel & Roots Choir has been employed as a sort of Newport Folk Festival palate-cleanser: a way to kick off the day with something kind, approachable, reverent and rooted in many folk traditions. This year, with Mavis Staples on top of the bill, the group, which opens the proceedings on Sunday, functioned as both and a theme-setter.

John McCauley's ragged roots-rock band Deer Tick has become a Newport Folk Festival staple, along with McCauley's frequent collaborators in Dawes and Delta Spirit.

Nickel Creek's Sara Watkins, Sean Watkins and Chris Thile started out as child prodigies, then built their band into a Grammy-winning commercial force. At the height of their success, though, the three decided to break up and pursue other projects — albeit temporarily, as the title of 2007's "Farewell (For Now) Tour" suggested.

Equal parts rowdy and loving, the husband-and-wife South Carolina duo Shovels & Rope radiates knockabout charm. Cary Ann Hearst and Michael Trent are equally adept at crooning moonily while locking eyes and tearing through blistering folk-rock anthems without seeming to take a breath. Hearst and Trent often swap instruments, giving their sets a freewheeling, unpredictable quality.