Collaboration has typified Avey Tare’s output since the turn of the century – those proto-Animal Collective recordings of Spirit They’re Gone, Spirit They’ve Vanished and Danse Manatee, which saw the beginnings of that band’s gradual amalgamation; Pullhair Rubeye with múm’s Kría Brekkan; the more garage-tinged Avey Tare’s Slasher Flicks project. Even Animal Collective, active now for the guts of two decades in some form or other, has always been a mutating thing from album to album, with various permutations of its members dipping in and out indiscriminately. Avey Tare – David Portner to his nearest and dearest – has been…