I bring you: DJ Fno Fno! (Messrs @fnogg & DJNoNo) and their Royals At The Gay Bar - Lorde - Royals vs Electric Six - Gay Bar for the Crumplbangers Challenge Collab Week. This got a special mention cos of the name ;-)
Idea was from fnogg entirely, production was shared between them, passing Ableton Live projects back and forth a few times.
fnogg did the first rough demo pass with YT ripped stems, DJNoNo then recreated a HQ Electric Six instrumental from the stems with a totally new instrumental mix (we couldn't find a HQ of the instrumental), and then edited it to the demo to fnogg's template. He then added that and the Lorde and Gay bar vocals HQ stems to match and created the breakdown and ending which wasn't in the demo.
fnogg then took it over and then redid the Gay bar timings and added more in, and did the drop/cutins and the whoops and basically made it 100% funnier. Passed it back to DJNoNo for final massaging, mastering, production and general faffing.
Artwork was a shared collab too, with DJNoNo at the controls and input, advice and other concepts from fnogg.