Metallica drummer Lars Ulrich makes his acting debut -- playing someone other than himself -- when Hemingway and Gellhorn premieres on HBO on Monday night. But Lars doesn't see the role, as Dutch documentary filmmaker Joris Ivens, as a springboard to Hollywood. He tells USA Today, "I don't have big acting career aspirations, but I love dabbling in different processes. I wasn't chasing this, but I couldn't say no... I took it very seriously. I studied the difference between how a Dutch person would say things in English and the way I would as a Dane. Most people couldn't tell the difference, but I can. And it needed to be right."

Metallica bassist Robert Trujillo is financing a documentary about the late jazz bassist Jaco Pastorius. The tentatively titled Jaco is being directed by Stephen Kijak, who did Stones in Exile about the recording of the Rolling Stones' Exile on Main St. The film will feature interviews with Red Hot Chili Peppers bassist Flea, Sting and Carlos Santana.

Pearl Jam guitarist Mike McCready re-activated his mid-'90s side project Mad Season for one song Wednesday night at a benefit in Seattle. McCready was joined by ex-Screaming Trees drummer Barret Martin to play "River of Deceit," with singer Jeff Rouse (from Duff McKagan's Loaded) and bassist Rick Friel filling in for deceased members Layne Staley and John Baker Saunders.

McCready has said that he and Martin have a bunch of music in the vaults that just needs vocals, which has fired up speculation that they might have an album in the works.

In other news...

Motley Crue's Nikki Sixx will throw out the first pitch at this Sunday's Los Angeles Dodgers - Houston Astros game at Dodger Stadium.