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On Saturday, April 20, Maynard James Keenan led his Sessanta tour to Los Angeles for an exhilarating performance at The Hollywood Bowl that honored the full scope of the legendary artist’s influence. While Kennan’s 60th birthday celebration tour traditionally stages only the artist’s latter two bands, A Perfect Circle and Puscifer–alongside progressive metal contemporaries Primus–this performance featured a special guest appearance from Tool, the frontman’s renowned first outfit in its hometown.

From the show’s outset, it was apparent that this 13th stop on the collaborative tour would be a very lucky night for attendees. Sit-in abounded through the ten alternating sets that compose the revue’s first, three acts, including guest spots from singer-songwriter Carina Round for APC’s “The Contrarian” and Smashing Pumpkins’ James Iha during APC’s “The Hollow.” In cross-program appearances, Keenan supported Primus’ 1991 fan favorite “Tommy the Cat,” and Les Claypool returned the favor for APC’s iconic “So Long, and Thanks for All the Fish,” donning an upright bass and bow to make the staging particularly special.

To round out its third and final independent performance of the evening, A Perfect Circle invited original members Paz Lechantin and Troy Van Leeuwen to perform “Judith.” After the Sessanta E.P.P.P. set, things took a turn as Keenan addressed the audience before the show’s grand finale, inviting fans to prime their cameras as he’d “picked up some strays.” With that, the frontman was joined onstage by Adam Jones, Danny Carey and Justin Chancellor, assembling the renowned Tool quartet for an explosive surprise treatment of its 1997 classic “Ænema.” Claypool joined Keenan on the microphone for this storming show highlight.After the ensuing roar of applause, the trio of alternative metal pioneers returned to business as usual for a collaborative treatment of Puscifer’s “Grand Canyon.”

The Sessanta tour will stage again tomorrow, April 23, and West Valley, Utah’s Maverick Center. After five further performances, the tour will conclude with a May 4 finale at Forest Hills Stadium in Queens, N.Y. For tickets and more information, visit sessantalive.com/.

Watch Tool’s surprise performance below, and click here to watch Billy Strings’ Sessanta sit-in earlier this month.

Read the full setlist on setlist.fm