The Eagles “lost a brother,” in the band’s words, just days before opening a trailblazing headlining series at the Sphere. J.D.

Souther, a collaborator and co-writer on many of the band’s enduring classics, died Tuesday at age 78. Souther had a hand in such hits as “Best of My Love,” “James Dean,” “New Kid in Town,” and “Heartache Tonight.” He also worked with such rock icons as Linda Ronstadt, James Taylor, Bonnie Raitt and Bob Sege r.

The band posted a message on its website Wednesday, under the head “In Memoriam”: “We have lost a brother, a friend and a brilliant collaborator, and the world has lost a great songwriter, a pioneer of the Southern California sound that emerged in the 1970s. “J.D.

Souther was smart, talented, well-read, and in possession of a wicked sense of humor. He loved a good meal, a good movie, and a good Martini ..

. And he loved dogs, adopting many, over the course of his lifetime.” The band also noted Souther’s range as “a student of the deep roots of the best American music — from country, to jazz, to classical, as well as ‘Standards’ from the Great American Songbook — and that knowledge and appreciation informed his work.

” The Eagles open their 20-show residency on Friday and Saturday night. It is not yet known how or if the band will pay tribute to Souther during the shows. We understand it is possible.

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