He sent me the music with the following message:
"As a 30th birthday gift, and a thanks for the hours I spent enjoying that book, what I've done is compose a short piece of music that, hypothetically, if Besti Bori were made into a film, would be playing during the opening credits. You'll have to use your imagination a little bit as some of the instruments really don't quite sound like their real-life counterparts. Happy birthday man! And get back writing soon!"
Greatest 30th birthday present ever. Well, except for maybe these. You can listen to the theme tune below. Enjoy!