Hah... I will say this, Mach is on the song I own the copyright to. And we've been in touch already and dude got really salty about it real fast (and then refunded me the money I paid for the Nic Craven EP). I've spoken to the other copyright holder and he wants me to just ask the dude for some free records and in return we'll give him permission but his saltiness about it all means we may need to call in our lawyer (which he definitely doesn't want to do)..
In fact, I kinda mentioned it to him already and his response was something along the lines of 'good, it will make the record that much more rare and will be worth more money'... Kinda a scumbag thing to say when we're just trying to work out a fair deal.