Idahoan singer-songwriter Josh Ritter, known for his ballads and folk-music style, has appeared at the Newport Folk Festival and performed with artists such as Joan Baez. Ritter's fifth and latest album, The Historical Conquest of Josh Ritter, which came out last year, received much critical praise. He performs with folk singer Langhorne Slim, who has appeared at the Bonnaroo Music Festival in Manchester, Tenn., and toured with Cake and Violent Femmes, at 7 p.m. Tuesday at Recher Theatre, 512 York Road, Towson. $20. Call 410-337-7210 or 410-547-7328 or go to ticket master.com.