pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1606-FC.ps) >>/Users/jc/w/tmp/Tune-1606-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/OldEnglishCountryDances/FC/%1:OTHEWEARYWATERSOFTYNE.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Form_16060.log 854 Log file, useful mostly for debugging
Form_16063.log 815 Log file, useful mostly for debugging
Form_16064.log 906 Log file, useful mostly for debugging
Tune-1606-FC.abc 385 ABC music file with the extracted tune(s)
Tune-1606-FC.ps 33959 PostScript
Tune-1606-FC.txt 385 Plain-text file with the extracted tune(s)
Tune-1606-get.log 4896 Log file, useful mostly for debugging
Tune-16060-get.log 3754 Log file, useful mostly for debugging
Tune-16061-get.log 5975 Log file, useful mostly for debugging
Tune-16069-get.log 3194 Log file, useful mostly for debugging
These files should be available for 24 hours.