pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-39155-Aird-v4.ps) >>/Users/jc/w/tmp/Tune-39155-get.log 2>&1" returned status 256
http://www.campin.me.uk/Aird/Aird-v4.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-39155-Aird-v4.abc 385 ABC music file with the extracted tune(s)
Tune-39155-Aird-v4.ps 35370 PostScript
Tune-39155-Aird-v4.txt 385 Plain-text file with the extracted tune(s)
Tune-39155-get.log 49871 Log file, useful mostly for debugging
These files should be available for 24 hours.