The footballer has previously uploaded videos of himself drumming to Foo Fighters, Coldplay and others
The bassist says Cobain 'wasn't thinking clearly' before his death
McEnroe performs alongside wife Patty Smyth
Track is believed to date back to 1993 or 1994
The alternate take is thought to date back to 1991
Local TV host urged the city of Seattle to release photos he said would show Nirvana frontman was murdered
Maggie Poukkula, 19, is the daughter of a former Cobain bandmate and school friend
The film will be released on DVD and in selected cinemas during Autumn 2015
'Nirvana' was originally released in 2002
'Cobain: Montage Of Heck' was released in May, featuring unseen footage of the late Nirvana frontman