UPDATE - 4/11@10:28PM: Les Claypool posted the following message along with a photo to his Facebook page (thanks RushFanForever):

Last night was a pinnacle moment for this Ol’ Colonel’s career. My dear friend and childhood superhero #GeddyLee decided to join The Delirium onstage in Toronto for our rendition of Sean’s Dad’s, "Tomorrow Never Knows".

As Geddy slinked out of the shadows with my Pachyderm bass in his mighty grips, the crowd slowly swelled to a frenzy of recognition. The energy and excitement was so palatable that it brought a joyful tear to my eye. Like Joe DiMaggio stepping back up to the plate, Geddy proceeded to show us all why he is one of the greatest to ever wield a four string piece of furniture. It was pure magic and I imagine I'll feel the tingle on the back of my neck for some time.

Alas, our recording equipment went on the fritz so it will only live in our minds...and on the handful of cellphones that were fortunate enough to capture the glory. Good times.

- Les Claypool

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UPDATE - 4/11@10:38AM: Geddy posted a few photos from the show to his Instagram along with a short message:

View this post on Instagram

Last night the good folks of the Claypool/Lennon Delirium kindly invited me to invade their show during the closing number..The Beatles' "Tomorrow Never Knows"...it was such a blast to jam with these talented guys and most especially to appear with my pal .. the inimitable Les Claypool .. . thanks for the awesome show boys! #ClaypoolLennonDelirium #DanforthMusicHall #TheBeatles #LesClaypool #TomorrowNeverKnows #twobassplayersarebetterthanone #DonQuiballes

A post shared by Geddy Lee (@geddyimages) on Apr 11, 2019 at 7:26am PDT

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The Claypool Lennon Delirium kicked off their 2019 Spring Tour at the Danforth Music Hall in Toronto last night, and Rush's Geddy Lee sat in with the band for their cover of the Beatles classic Tomorrow Never Knows as seen in this video uploaded by YouTube user TimmyB707 (thanks RushFanForever). The Claypool Lennon Delirium is a collaboration between Primus frontman Les Claypool and Sean Lennon. The duo recently released their second studio album South of Reality back in February.