Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Roy_Goldring/cont.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2175-cont.ps) >>/Users/jc/w/tmp/Tune-2175-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Roy_Goldring/cont.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_21750.log 292760 Log file, useful mostly for debugging
Coll_21751.log 284330 Log file, useful mostly for debugging
Coll_21757.log 696519 Log file, useful mostly for debugging
Coll_21758.log 292761 Log file, useful mostly for debugging
Coll_21759.log 281520 Log file, useful mostly for debugging
Tune-2175-cont.abc 149 ABC music file with the extracted tune(s)
Tune-2175-cont.ps 6 PostScript
Tune-2175-cont.txt 149 Plain-text file with the extracted tune(s)
Tune-2175-get.log 7342 Log file, useful mostly for debugging
Tune-21750-get.log 5344 Log file, useful mostly for debugging
Tune-21752-get.log 2828 Log file, useful mostly for debugging
Tune-21754-get.log 5677 Log file, useful mostly for debugging
Tune-21756-get.log 4445 Log file, useful mostly for debugging
These files should be available for 24 hours.