LONDON (AP) — The Eurovision Song Contest , which aims to be an upbeat celebration of music and unity, is facing the biggest crisis in its seven-decade history after four countries walked out of the competition over Israel’s participation, and others indicated they could join the boycott. Spain, the Netherlands, Ireland and Slovenia announced they will not take part in the 2026 contest in Vienna in May after organizers declined to expel Israel over its conduct of the war against Hamas in Gaza .