pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-46617-30742_Shantuse.ps) >>/Users/jc/w/tmp/Tune-46617-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP3/30742_Shantuse.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_46617.log 969 Log file, useful mostly for debugging
Tune-46617-30742_Shantuse.abc 761 ABC music file with the extracted tune(s)
Tune-46617-30742_Shantuse.ps 35687 PostScript
Tune-46617-30742_Shantuse.txt 761 Plain-text file with the extracted tune(s)
Tune-46617-get.log 4771 Log file, useful mostly for debugging
These files should be available for 24 hours.