U2 fans attending the Toronto Film Festival in Canada next month (Sep07) are in for a treat - producer Daniel Lanois' new film, which is premiering at the event, features footage of the band rehearsing songs from their upcoming album. In musical documentary Here Is What Is, the celebrated music mogul attempts to explain what makes him one of the best producers on the planet. The film also features appearances by Willie Nelson, Sinead O'Connor and former Roxy Music star Brian Eno.