Ok, this is difficult, personally I'm finding this probably perhaps the most difficult one I've tried yes, maybe just me? The key changes are tricky, at least in the version I'm trying. So it starts off in the middle (No sharps or flats), then it goes all the way to the top (7 sharps), everything sharp, even if it doesn't have a sharp (Ok, I get that means it just goes to the next note); then it comes down sorta half way back (2 sharps), then down below where it started (3 flats), then back up again (4 sharps), then down again (one flat)...I'm lost by now 🙂
Can't play this without cheating yet, so not one take. Also I didn't have time to wet a reed, so halfway through I swapped to a fibracel reed (you can hear it's a lot 'brighter'). Started off sight reading, then ended up just winging it. Oh, and had to kick wife's dog's our near the end 🙂
https://dl.dropboxusercontent.com/u/97346875/Mac the Knife20170310.mp3