Night Seven: Jack Black joins for a cover of “The Spirit of Radio” by Rush.

 Night Eight: “Merry Christmukkah! Our nondenominational gift to you on this convergence of holiday cheer is Randy Newman’s classic ‘I Love L.A.’ — sung by Dave Grohl!” Since it was the final performance, Grohl and Kurstin were joined by the numerous musicians who joined them for this year’s Hanukkah Sessions, including Beck, Karen O, Jack Black, Kyle Gass, P!NK and Inara George.