Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/session/Oivan_Ilo/Rapukestit-Dm-64-4.abc/shottish"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4388-shottish.ps) >>/Users/jc/w/tmp/Tune-4388-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/session/Oivan_Ilo/Rapukestit-Dm-64-4.abc/shottish

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_43882.log 284810 Log file, useful mostly for debugging
Coll_43885.log 297411 Log file, useful mostly for debugging
Coll_43887.log 923820 Log file, useful mostly for debugging
Coll_43888.log 898620 Log file, useful mostly for debugging
Form_4388.log 883 Log file, useful mostly for debugging
Form_43885.log 847 Log file, useful mostly for debugging
Form_43886.log 983 Log file, useful mostly for debugging
Tune-4388-get.log 4136 Log file, useful mostly for debugging
Tune-4388-shottish.abc 172 ABC music file with the extracted tune(s)
Tune-4388-shottish.ps 6 PostScript
Tune-4388-shottish.txt 172 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.