pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-15682-10531_Air_Allegretto.ps) >>/Users/jc/w/tmp/Tune-15682-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MoF/10531_Air_Allegretto.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-15682-10531_Air_Allegretto.abc 661 ABC music file with the extracted tune(s)
Tune-15682-10531_Air_Allegretto.ps 36207 PostScript
Tune-15682-10531_Air_Allegretto.txt 661 Plain-text file with the extracted tune(s)
Tune-15682-get.log 6057 Log file, useful mostly for debugging
These files should be available for 24 hours.