They praised President Zelensky's "stamina and heroism”
Series creators Trey Parker and Matt Stone will also attend the "one night only" show this summer
'Precious Metals' ends with a funk-heavy bass-off between the pair
The actor visited the funk metal band's frontman at his winery
"Anthem of the heart and anthem of the mind"
The US tour will see them play Rush's 1977 album 'A Farewell to Kings' in its entirety
Musician previously suffered a heart attack in July 2014
'Primus And The Chocolate Factory' to be released on October 21
'Primus and the Chocolate Factory with the Fungi Ensemble'<em><em></em></em> will be released on October 21