WASHINGTON, DC: Echosmith performs a sold-out show at the 9:30 Club. February 26, 2015. ? Brandon Wu / for the Washington City Paper.

Four siblings, average age 18, make up Echosmith, which plays safe, generic, and extremely catchy pop-rock with lyrics that are not particularly wise beyond their years. That was enough to get them a deal with Warner Brothers (signed in 2012, when their average age was 15!), and sell out the 9:30 Club last night.

Their show was exactly what you’d expect: fun and competent but unexceptional, enough to get their fans excited but unlikely to leave a lasting impression. As far as family bands go, though, it’s hard not to think this one has some unusual potential.

For more photos, check out the full slideshow (16 images).