pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3755-Dunnechan-D-16-4.ps) >>/Users/jc/w/tmp/Tune-3755-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/reel/Dunnechan-D-16-4.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-3755-Dunnechan-D-16-4.abc 0 ABC music file with the extracted tune(s)
Tune-3755-Dunnechan-D-16-4.ps 0 PostScript
Tune-3755-Dunnechan-D-16-4.txt 0 Plain-text file with the extracted tune(s)
Tune-3755-get.log 0 Log file, useful mostly for debugging
Tune-37551-get.log 3248 Log file, useful mostly for debugging
Tune-37552-get.log 8297 Log file, useful mostly for debugging
Tune-37554-get.log 4069 Log file, useful mostly for debugging
Tune-37555-get.log 0 Log file, useful mostly for debugging
Tune-37556-get.log 4433 Log file, useful mostly for debugging
Tune-37559-get.log 6564 Log file, useful mostly for debugging
These files should be available for 24 hours.