One of New York City’s longest-running, free outdoor performing arts festivals is gearing up for its most diverse line-up since it was established 45 years ago.

The three-month BRIC Celebrate Brooklyn! concert series kicks off June 7 with performances by Grammy Award-winning blues musician Taj Mahal, British soul chanteuse Corinne Bailey Rae and the Harlem Gospel Travelers at Prospect Park’s Lena Horne Bandshell.

Announced Wednesday, the full-line up also includes rock band The Wallflowers, R&B crooners JOE and Stokely (of Mint Condition fame), Jamaican dancehall superstar Marcia Griffiths, Colombian experimental musician Lucrecia Dalt, rising glam pop star Jake Wesley Rogers and Pakistani musician Ali Sethi.

With this year’s theme of “looking to the future, while honoring the past,” BRIC Celebrate Brooklyn! has tapped L’Rain as its first-ever artist curator. The Crown Heights-born songwriter and multi-instrumentalist (whose real name is Taja Cheek) tells The Daily News she’s honored to have the gig.

“I grew up going to ‘Celebrate Brooklyn! and remember getting the pamphlets [and] the brochures in the mail,” she said. “So yeah, it’s a big deal for me.”

Hip hop innovator and Alvin Ailey choreographer Rennie Harris’s PureMovement dance company and Grammy Award-winning Malian Wassoulou musician Oumou Sangarè are among the performers making their debuts at the festival. Past headliners over the years have included Bob Dylan, Patti LaBelle, Angelique Kidjo, Erykah Badu and They Might Be Giants.

Some of the paid, ticketed shows include NxWorries — the art-duo composed of Anderson .Paak and Knxwledge — on June 24, and The Revivalists, appearing with Band of Horses on August 10. Proceeds from those concerts help support the non-profit media and arts organization’s free programming throughout the year.

L’Rain shared that most of her work as curator happens behind the scenes involving how programming will be framed and thinking through issues of equity across the whole season to ensure many different communities are involved.

“I think what I’m most proud of is honestly being able to work with the team, to really kind of round it out and and to have conversations about ... bringing artists to the table that maybe some of the team didn’t know, and also things that I’ve learned that I didn’t know about when I first started.”

L’Rain’s previous curations include a music series at MoMA’s PS1 and the High Line. BRIC Celebrate Brooklyn! executive producer and artistic director Diane Eber tells The News that L’Rain was “uniquely qualified” for the inaugural role because of her “deep connection to the Brooklyn community.

She’s also taking pride in Celebrate Brooklyn’s weekend-long celebration of the 50th Anniversary of Hip-Hop on Aug.11 and Aug. 12. With the acts still being confirmed, the programming will be dedicated to acknowledging the role women have played in the culture, particularly Brooklyn’s impact.

The borough is the birthplace of rap veterans like Big Daddy Kane, MC Lyte, Jay-Z, The Notorious B.I.G., Nas and newer hitmakers Bobby Shmurda, Young M.A, Fivio Foreign and Lola Brooks.

“What’s really great in thinking about the 50th anniversary is that oftentimes, hip hop can be siloed, but again, you’ll see hip hop, across the season, which is exciting,” L’Rain said. “Obviously, there will be this specific programming around Hip Hop 50th but hip hop throughout the season makes sense. It’s the biggest cultural movement you know, of the last umpteen years.”