Singer-songwriter Andrew Bird's formal training had a strong influence on the type of music he played. His 1996 debut, Music of Hair, commences with a gentle waltz and keeps things on the traditional side of the folk-y spectrum. Since then, Bird’s music has evolved; the songs on his new album, Inside Problems, come off as his most nuanced to date. The album includes a variety of references to author Joan Didion and sometimes finds Bird adopting a Lou Reed-like vocal delivery. The singer-songwriter comes to the Agora tonight at 8.