Hi,
I'm used to work on music backgrounds ... I prefer getting a film with the timecode and to work on it, to sending tracks just like this ... but in some cases the timing and a description of the mood/ambience you need can be enough ... check some samples on my www.laco.biz page
I'm music composer, I propose my collaboration on music score / instrumental & background tracks for interesting short films .... Some sound samples on www.laco.biz