pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-67826-10_SISTER_JEAN.ps) >>/Users/jc/w/tmp/Tune-67826-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/HaandMeDoonDaFiddle/10_SISTER_JEAN.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_67826.log 982 Log file, useful mostly for debugging
Tune-67826-10_SISTER_JEAN.abc 905 ABC music file with the extracted tune(s)
Tune-67826-10_SISTER_JEAN.ps 34000 PostScript
Tune-67826-10_SISTER_JEAN.txt 905 Plain-text file with the extracted tune(s)
Tune-67826-get.log 4616 Log file, useful mostly for debugging
These files should be available for 24 hours.