Here's a clip of Van Halen playing Jump on their reunion tour earlier this month in Greensboro, NC:

Something sounds off.

It seems that the synthesizer part is played on a pre-recorded backing track, and at that show it was played back at 48 khz instead of 44.1 khz. RW370, Jump (in pitch)! "Eddie tries to transpose on the fly and match the wildly fucked up keyboards but the great thing there is the difference in pitch is non-musical - about 1.5 semitones sharp. So there’s no frets he can choose to fix the problem!"