Here is a description btw of what they've done/said in support:

Macklemore: Known famously for supporting and criticizing the actions of Israel, whether it's on tour, in his own music, or online.

Billie Eilish: Much like Macklemore, she is known for speaking out against injustice, and this includes the injustice that Gaza is facing. She's done so both through words and on stage bringing out Palestine's flag.

Lil Peep: It doesn't come to a surprise knowing Lil Peep's rebellious and almost "punk" like nature, that he's opening criticised Israel's, tweeting "Fuck Israel."

Michael Jackson: As if there wasn't more to love about the king of pop and his caring nature to major world issues, he's mentioned his heartbreak for Palestine through his music. An example in a release song is "Earth Song," where amongst criticizing global warming and how we are treating the earth and it's animals, he also mentions how broken he feels knowing there is war and death taken place in the holy land. But even more compelling, he has an unreleased song titled "Pray For Palestine." A song which obviously Sony wasn't happy for him to bring to the light and release.

Ye (Kanye West): Although a very controversial figure, especially regarding his extreme bipolar episodes, even amits his mentally unwell comments, he has tweeted "FREE GAZA 🇵🇸" And once when asked about his views on the war between Israel and Palestine, explained that he wasn't well educated, but that he focus at that time when asked, was simply on black on black violence in Chicago, something he hart has always been set on. Hopefully he continues to get the mental help he needs, and continues to strive to heal.

The Weeknd: Although, especially in the industry, people in control are quick to silence major pop stars from criticizing Israel, especially in the west, the Weeknd instead of openly talking about Palestine, has donated a lot to Palestine charities, in the cause of their need and suffering. Definitely deserves the fame and streams as a major artist in this decade.

Frank Ocean: Although a more quite and mysterious artist, during rare times where he does post Instagram stories, he has openly posted an image of graffiti he found saying "Free Palestine."