pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-35948-21203_POP_GOES_THE_WEASEL.ps) >>/Users/jc/w/tmp/Tune-35948-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kohlers/21203_POP_GOES_THE_WEASEL.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-35948-21203_POP_GOES_THE_WEASEL.abc 612 ABC music file with the extracted tune(s)
Tune-35948-21203_POP_GOES_THE_WEASEL.ps 36137 PostScript
Tune-35948-21203_POP_GOES_THE_WEASEL.txt 612 Plain-text file with the extracted tune(s)
Tune-35948-get.log 5752 Log file, useful mostly for debugging
These files should be available for 24 hours.