pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-45712-a2.ps) >>/Users/jc/w/tmp/Tune-45712-get.log 2>&1" returned status 256
http://www.fiddletech.com/music/a2.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-45712-a2.abc 266 ABC music file with the extracted tune(s)
Tune-45712-a2.ps 34604 PostScript
Tune-45712-a2.txt 266 Plain-text file with the extracted tune(s)
Tune-45712-get.log 3953 Log file, useful mostly for debugging
These files should be available for 24 hours.