pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7534-tunebook.ps) >>/Users/jc/w/tmp/Tune-7534-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/tunebook.org.uk/tunebook.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
Form_75340.abc 1131 ABC music file with the extracted tune(s)
Form_75340.log 993 Log file, useful mostly for debugging
Form_75340_001.svg 24925 Scalable Vector Graphics format
Tune-7534-get.log 8254 Log file, useful mostly for debugging
Tune-7534-tunebook.abc 524 ABC music file with the extracted tune(s)
Tune-7534-tunebook.ps 35941 PostScript
Tune-7534-tunebook.txt 524 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.