pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-93854-2bar-alphabetical.ps) >>/Users/jc/w/tmp/Tune-93854-get.log 2>&1" returned status 256
http://wellington.session.nz/tunebooks/2bar-alphabetical.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-93854-2bar-alphabetical.abc 135 ABC music file with the extracted tune(s)
Tune-93854-2bar-alphabetical.ps 31890 PostScript
Tune-93854-2bar-alphabetical.txt 135 Plain-text file with the extracted tune(s)
Tune-93854-get.log 4395 Log file, useful mostly for debugging
These files should be available for 24 hours.