Pearl Jam's recent two-night stand at Fenway Park in Boston found the band making room in its setlist for tributes to some local heroes — including Aerosmith, whose own Tom Hamilton stopped by during the Aug. 7 set to sit in on a performance of "Draw the Line."

You can watch Hamilton's Pearl Jam summit in the above video, which begins with frontman Eddie Vedder offering a crowd introduction before the number starts. It's just the latest example of how Hamilton's making the most of Aerosmith's current downtime, which has the band on hiatus while singer Steven Tyler is busy promoting his recent We're All Somebody From Somewhere solo LP.

As previously reported, Hamilton set aside some time this summer to tour with Thin Lizzy's current lineup — a run of dates he's somewhat bemusedly recounted via his Twitter account, where he also weighed in prior to joining Pearl Jam at Fenway.

"Twenty-four hours ago I was on stage with Thin Lizzy," tweeted Hamilton. "Tonight I got to play 'Draw the Line' with Pearl Jam. How many bands can I join in a weekend?"

JamBase reports that Pearl Jam's Aug. 7 set also included a cameo from Dinosaur Jr. frontman J. Mascis, who joined in during the encore to help out on a cover of Neil Young's "Rockin' in the Free World." Mascis is in the middle of a world tour supporting the new Dinosaur Jr. LP, Give a Glimpse of What Yer Not, while Pearl Jam wrap up their current touring commitments with a two-night stand at Chicago's Wrigley Field later this month.

Watch Pearl Jam and J. Mascis Perform 'Rockin' in the Free World'

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