From what I've read (there's an article out there
somewhere that covers a panel all the composers were on at the New york Film Festival, My Google - fu isn't findin it) they eached recorded loads of material and then
traded it
back and forth, which means that there is an entire «desert rock album» out there that we hear in bits in pieces whenever we're on the run outside Sandy Shores, but I'd love to hear the whole thing.