Media Composer 3.0 will work just fine (as long as you’re cutting your multiclips at a lower res, but this is true of any version), I just finished cutting a music video, up to 18-split multicam workflow on 3.0.
I’d cut at a lower compression ratio, maybe (10:1-28:1) or just work at DNxHD 36 (depending on the resolution).
“Where that light source is coming from?”
“The same place as the music.”