Though Fledgling has a geographical gimmick—half the quartet hails from Boston, the other half from London—the result is a rare contemporary case of nonhyphenate rock. Vigorous and direct, the band relies on such old-fashioned attributes as songcraft and singer/guitarist/producer Eileen Rose’s big voice. With Marry Me Jane at 9 p.m. at the 9:30 Club’s Atlantis, 930 F St. NW. $5. (202) 393-0930. (MJ)