pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-26150-SweetnessOfMary.ps) >>/Users/jc/w/tmp/Tune-26150-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/SweetnessOfMary.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_26150.log 285735 Log file, useful mostly for debugging
Tune-26150-SweetnessOfMary.abc 1450 ABC music file with the extracted tune(s)
Tune-26150-SweetnessOfMary.ps 44695 PostScript
Tune-26150-SweetnessOfMary.txt 1450 Plain-text file with the extracted tune(s)
Tune-26150-get.log 5501 Log file, useful mostly for debugging
These files should be available for 24 hours.