pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-83986-tb12.ps) >>/Users/jc/w/tmp/Tune-83986-get.log 2>&1" returned status 256
http://nigelgatherer.com/tunes/abc/tb12.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-83986-get.log 4123 Log file, useful mostly for debugging
Tune-83986-tb12.abc 368 ABC music file with the extracted tune(s)
Tune-83986-tb12.ps 34780 PostScript
Tune-83986-tb12.txt 368 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.