She couldn't work with Dr. Luke anymore even if she wanted to, I thought, what with his new contract to Sony or whatever.
But it'd be such an interesting track, they'd end up competing with each other on their own track.
Not too much on Lukas now. Even though the guy is perceived as Dr. Generic, he could be a hit sometimes. He's resurrected careers and game-changing tracks before. We don't know what their blending would sound like, so we can't really assume. Though like what others said, the chances of Gaga working with him are very slim to the point where it's almost impossible.
She can work with Dark Child. His rough unfinished Gaga demos **** on You Da One.
But at this point she probably thinks that's beneath her too.
Her collaboration with RedOne remains her best though. He's always giving her incredible instrumentals. No need to name the ones on TF/TFM, but also on BTW.
Judas/Scheibe instrumentals are amazing. It's the lyrics or theme that make them less commercial IMO.