Wtf?! At 5:00-5:25 his drumming doesn't seem to match the sound. I think the audio is prerecorded.
RIP.

he's midi triggering sounds so there's a disconnect between the type of sound you're expecting and the sound you're hearing. also possible there's millisecond delay from the samples and/or slight latency in the playback.

But you can hear the sounds I mean be triggered starting at about 5:00 as he hits the midi-zylophone thing, then the sound is triggered again at 5:08 when he clearly didn't play them and a few times after that. Perhaps what I'm hearing isn't supposed to be percussion and is just the backup music synching with the percussion....but there are definitely kettle drum and other percussion sounds happening when he isn't hitting any drum.

I may be missing what you're seeing, but it looks legit to me. The cymbals and some of the pads on that side are electronic too. They can also be configured to play different samples on successive hits (or velocities) to further muddle things.

Thing that struck my attention was a couple times he switched from matched to traditional grip and back.

*livemusic *comedy

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This one is a dupe i'm afraid *dupeof=https://videosift.com/video/Neil-Peart-drum-solo-on-Letterman-last-night

This video has been nominated as a duplicate of this video by eric3579. If this nomination is seconded with *isdupe, the video will be killed and its votes transferred to the original.

*Kill

Permanently discarding this video - kill requested by BSR.