i'm wary about letting a tune loose to anyone from any of the labels i look after. it only takes one person to stickit on soulseek and you can kiss a lot of the eventual vinyl sales good bye.
i use cds to send snippets of the tracks to folks, like sugggested above. i find cd a disposable medium, but a similair white label is viewed by me at least with more respect for scratches etc, and for wanting to know whats on there LOT more (as i get sent lots of stuff) but even if i loved the track, i am down with what WRONG says, i still dont OWN it. bizarre!