The weekend's standout by far is music biodoc "Kurt Cobain: Montage of Heck," which is using theaters successfully to promote its near-term HBO debut. Whatever the strategic play involved, its strong numbers suggests that taking advantage of a mixture of top theaters and early home availability is one future course for high-profile wider-interest specialized films. Also notable is the strong initial response to another rock-based documentary, "Don't Think I've Forgotten: Cambodia's Lost Rock 'n' Roll" (Argot), which is off to a great start at New York's Film Forum.