A year ago, a Sharon Van Etten show at New York's tiny Mercury Lounge would've seemed just about right: up-and-coming East Coast singer-songwriter with a reputation for a solid live show playing to a small but growing fanbase. But that was before the onetime indie label publicist spent a year building up her rep — opening for pals the National, working the festival circuit, making her network TV debut on Jimmy Fallon. Last night's gig was just a little warmup before Van Etten embarks on an international headlining tour in support of her much-anticipated third album, Tramp (due February 7). Judging by her brilliant performance and the electric mood in the room, she isn't likely to be playing spaces this intimate much longer. With all the buzz and high expectations, it was clear that neither Van Etten nor her fans knew quite how to process all the newfound attention.