Diedre O'Callaghan

THE NATIONAL is back this month with Trouble Will Find Me, the follow-up to 2010’s High Violet and an anticipated addition to the Brooklyn, N.Y.–based indie rockers’ catalogue of soaring melancholy. In the same way that so many of the band’s tracks build slowly to a brooding crescendo, The National has managed to steadily develop a growing fan base while continuing to earn critical praise in the 12 years since releasing its self-titled debut. Now well into their 30s and 40s, Matt Berninger and Co. are firmly established as the post-hipster band du jour.

The band has also made quite a few friends along the way. From collaborations with minimalist composer Philip Glass and jam-band icons Bob Weir and Trey Anastasio to wrangling a who’s who of the indie scene (Grizzly Bear, Bon Iver, Cat Power) for the 2009 compilation Dark Was the Night — as well as for last month’s Crossing Brooklyn Ferry festival (TV on the Radio, Phosphorescent) — the band’s circle of influence (and of influencers) is still growing.

Here’s a look at some of The National’s most notable associates, including some you might see on stage with — or hear covered by — the band during its summer tour, which kicks off May 16.