pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-13458-4171-Wandering_Willie-abc1.ps) >>/Users/jc/w/tmp/Tune-13458-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/4171-Wandering_Willie-abc1.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_13458.log 1483880 Log file, useful mostly for debugging
Tune-13458-4171-Wandering_Willie-abc1.abc 1577 ABC music file with the extracted tune(s)
Tune-13458-4171-Wandering_Willie-abc1.ps 41697 PostScript
Tune-13458-4171-Wandering_Willie-abc1.txt 1577 Plain-text file with the extracted tune(s)
Tune-13458-get.log 4770 Log file, useful mostly for debugging
These files should be available for 24 hours.