Opal Agafia and The Sweet Nothings, a self-described “roots n roll” group, will bring their genre-defying mash-up of Ozark mountain blues and soul to Four Quarter’s stage. Agafia began playing local venues in 2015, and The Sweet Nothings band was formed shortly after. Musicians Justin Easter, Derek Russell, Ron Landis, Michael Schembre and Elijah Brinson provide a full string band — fiddle, mandolin, guitar, dobro, telecaster guitar, electric bass and drums — to Agafia’s lead vocals. The Eureka Springs-based singer and band cite The Temptations, Lyle Lovett, Emmylou Harris and Aretha Franklin among their influences. Tickets are $10 in advance and at the door, and the show starts at 10 p.m.