pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2784-ShepherdsHoliday.ps) >>/Users/jc/w/tmp/Tune-2784-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Playford/ShepherdsHoliday.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_27847.log 465411 Log file, useful mostly for debugging
Tune-2784-ShepherdsHoliday.abc 338 ABC music file with the extracted tune(s)
Tune-2784-ShepherdsHoliday.ps 34409 PostScript
Tune-2784-ShepherdsHoliday.txt 338 Plain-text file with the extracted tune(s)
Tune-2784-get.log 4532 Log file, useful mostly for debugging
Tune-27842-get.log 3166 Log file, useful mostly for debugging
Tune-27845-get.log 7481 Log file, useful mostly for debugging
These files should be available for 24 hours.