Whoever got the idea of that backdrop is a genius! L-o-v-e!
Last night's interval act included 1979 winner Gali Atari singing her entry Hallelujah joined by other Eurovision winners Conchita Wurst and Måns Zelmerlöw and runner ups Eleni Foureira and Verka Serduchka. (From 8mins 45)
That was already third time the song has featured in the Eurovision final as also last time Israel hosted the show back in 1999 it was there, and even closing the show - the only time the show has ended with some other song than the winner btw - when then winner Charlotte Perrelli then Nilsson was joined on stage by all the toher artists to sing it for the memory of Balcan war victims (on video from 3h 10mins onwards)
And of course it was also sun in 1979 contest when it won at home soil in Jerusalem. The song is a true classic with many meanings.