In terms of the show itself, the Eilish mumble appears central to her relatability: she is, from the off, far more approachable than La Swift, the Business Barbie with the celebrity athlete husband and the preternatural gift for songwriting. Swift, certainly, wasn't likely to allow a director to film her having her ankles strapped up backstage, or going through a rehearsal session with her vocal coach, or chatting while applying her pre-gig contouring. ("It really reads from a distance," notes Cameron, in full 'cool dad' mode.) Her stage outfit - just the one, unlike Swift's six billion - is a lightly worn shrug: loose sports jersey, backward-turned baseball cap, Limp Bizkit shorts, glasses apparently sourced from the venue's lost-and-found box. It's not even smart casual, and yet over the course of this concert - liberated to move in any which direction, both physically and musically - Eilish becomes a recognisably Cameronian figure of interest: a woman who comes to command an army of diehard followers while reshaping the fabric of time and space. Non-diehards (and here your correspondent must include himself) might want a little more variation in the songcraft, gazillion-sellers though these tracks may be, beloved though they visibly are of this crowd, captured trilling along with tears in their eyes. (Cameron catches so much saltwater I wondered if Hit Me Hard and Soft was going to function as an Avatar origin story: this is how whole planets flood.) And the tropes of these all-new concert movies are now such one senses the Documentary Now! lads in the wings, preparing a bumper double episode: they could have a field day with the 'puppy room' Eilish insists on having backstage so as to reduce pre-gig stress ("everyone needs some dog love"). None of this matters, though, so long as Cameron films his subject with much the same awestruck gaze as he once did Sarah Connor and Ellen Ripley. Part of the filmmaker's fascination, I think, is that Eilish has successfully accomplished something he hasn't: to downsize. When Eilish sits crosslegged on her comparatively no-frills stage ("I don't want anything between me and them", she tells her director) and hushes the crowd into total silence before one song, she shrinks a cavernous concert venue to a small, tight friendship circle, as safe a space for creation as her own teenage bedroom. Eilish gets Cameron to think small for the first time in decades: the result is a rare concert movie that converts the colossal spectacle of the internationally touring pop show into something personal, intimate and very charming.
Billie Eilish: Hit Me Hard and Soft is now playing in cinemas nationwide.






