pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-17393-WilliamClarketunes.ps) >>/Users/jc/w/tmp/Tune-17393-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
Tune-17393-WilliamClarketunes.abc 288 ABC music file with the extracted tune(s)
Tune-17393-WilliamClarketunes.ps 33915 PostScript
Tune-17393-WilliamClarketunes.txt 288 Plain-text file with the extracted tune(s)
Tune-17393-get.log 4385 Log file, useful mostly for debugging
These files should be available for 24 hours.