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(If you don't know Finneas, he's probably the most famous one here. He's Billie Eilish's brother/ producer-writer; he's usually on stage w her and they're seen as a duo unit, but I think he's doing some more solo stuff now. Billie's also spoken in support of Palestine)
Ed Sheeran when his remaining acts, 2 of whom are Irish and the other 2 Gen Zers, don't stand for Zionist censorship: 
You could fire your publicist and stand with Macklemore. Chapelle Roan left her agency over some pedo shit. If I recall.
Chappell Roan is worth 10,000 Ed Sheerans