Chevalier Theatre welcomes singer/songwriter Neko Case for her first Medford Performance. A longtime member of the indie rock group the new Pornographers, Case’s body of work has spanned and drawn on a range of traditions including country, folk, art rock, indie rock, and pop, and is frequently described as defying or avoiding easy generic classification. Opening the show will be Imaad Wasif, a singer, guitarist and songwriter whose music combines elements of psychedelic folk and rock. Tickets are $55 to $75 through the Chevalier Theatre website/Ticketmaster. To avoid online ordering fees, purchase tickets at the Chevalier Theatre Box Office, which is open on Fridays and Saturdays from noon to 6 p.m., as well as two hours before every Chevalier Theatre show.