pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7537-56_WhimOfTheMoment.ps) >>/Users/jc/w/tmp/Tune-7537-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1791/Thompson/56_WhimOfTheMoment.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_75370.log 565850 Log file, useful mostly for debugging
Coll_75378.log 289950 Log file, useful mostly for debugging
Tune-7537-56_WhimOfTheMoment.abc 739 ABC music file with the extracted tune(s)
Tune-7537-56_WhimOfTheMoment.ps 33604 PostScript
Tune-7537-56_WhimOfTheMoment.txt 739 Plain-text file with the extracted tune(s)
Tune-7537-get.log 4679 Log file, useful mostly for debugging
Tune-75377-get.log 4655 Log file, useful mostly for debugging
These files should be available for 24 hours.