The piano was blocking some of the projected content, so I took some of the shots and filled in the gaps behind him, removed reflections from the piano, etc.
The wide shots needed a progression of rocks filling in the scene. I used a mixture of Cinema 4D cloner object and x-particles to scatter and animate the rocks.
Fairly simple set up. Just some basic colored area lights and a cave HDRI to match the reflections. Rendered out with Octane.