pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-13366-WilliamClarketunes.ps) >>/Users/jc/w/tmp/Tune-13366-get.log 2>&1" returned status 256
http://www.maryhumphreys.co.uk/WilliamClarketunes.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
Coll_13366.log 133127 Log file, useful mostly for debugging
Tune-13366-WilliamClarketunes.abc 293 ABC music file with the extracted tune(s)
Tune-13366-WilliamClarketunes.ps 34389 PostScript
Tune-13366-WilliamClarketunes.txt 293 Plain-text file with the extracted tune(s)
Tune-13366-get.log 7208 Log file, useful mostly for debugging
These files should be available for 24 hours.