pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2538-20562_Gumbo_Chaff.ps) >>/Users/jc/w/tmp/Tune-2538-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/20562_Gumbo_Chaff.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-2538-20562_Gumbo_Chaff.abc 670 ABC music file with the extracted tune(s)
Tune-2538-20562_Gumbo_Chaff.ps 34915 PostScript
Tune-2538-20562_Gumbo_Chaff.txt 670 Plain-text file with the extracted tune(s)
Tune-2538-get.log 4783 Log file, useful mostly for debugging
Tune-25380-get.log 4377 Log file, useful mostly for debugging
Tune-25386-get.log 3301 Log file, useful mostly for debugging
Tune-25388-get.log 7097 Log file, useful mostly for debugging
These files should be available for 24 hours.