FILE - Lead singer of the US rock band Nirvana Kurt Cobain is shown in a 1993 file photo. Cobain is the focus of a new documentary that probes the life and untimely death of the Nirvana singer-guitarist. It will be released in theaters next year and air exclusively on HBO, the network said Tuesday, Nov. 25, 2014. (AP Photo/Mark J.Terrill, File)