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Beyoncé is mourning D’Angelo ... taking to her website to honor the Grammy-winning R&B neo-soul icon after his death from pancreatic cancer.

Hop on Beyoncé's site and it zips through her "Cowboy Carter" tour shots ... before landing on a photo of D’Angelo paired with a heartfelt tribute. beyonce.com

Beyoncé praised his music, voice, piano chops, and artistry -- calling him the pioneer of neo-soul who transformed rhythm and blues forever ... adding that no one in the biz will ever forget him.

It’s clear D’Angelo left a massive mark on Beyoncé ... and plenty of other stars too, with Jamie Foxx , 9th Wonder , Bryan-Michael Cox , Flavor Flav , and more all paying tribute to the late legend. Gallery Launch Gallery Getty

The "Brown Sugar"

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