This link shows that it has a duet for the two instruments but then when i try to listen to it, it doesn't work.
Can someone tell me if that's not supposed to be there, and it's just an error or do they actually have a Clarinet and Sax duet for Canon in D?
I'm referring to this http://www.8notes.com/clarinet-saxophone_duet/

It is there, I have just listened to it. Click on the midi file.