Looks like Peermusic has the rights to "The Blackfly Song" and a few others, so that's a good place to start. Peermusic lists a song titled "Log Drive," and I'm guessing that's the same song.
Here's an email address: sfcorp@peermusic.com (corporate). You might be better off to contact the Canadian office: toronto@peermusic.com.

I emailed SOCAN and Shelley Posen and Borealis Records and asked them to post here. Keep your fingers crossed and hope for a reply.

-Joe-