Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/FrostIsAllOver.abc/500"

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.55 512x512 ]
filesizedescription
Coll_28790.log 534508 Log file, useful mostly for debugging
Tune-28790-500.abc 354 ABC music file with the extracted tune(s)
Tune-28790-500.txt 354 Plain-text file with the extracted tune(s)
Tune-28790-get.log 3029 Log file, useful mostly for debugging
These files should be available for 24 hours.