pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7848-MelancholyMartin.ps) >>/Users/jc/w/tmp/Tune-7848-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Playford/MelancholyMartin.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-7848-MelancholyMartin.abc 274 ABC music file with the extracted tune(s)
Tune-7848-MelancholyMartin.ps 32762 PostScript
Tune-7848-MelancholyMartin.txt 274 Plain-text file with the extracted tune(s)
Tune-7848-get.log 4575 Log file, useful mostly for debugging
Tune-78481-CR05.abc 2380 ABC music file with the extracted tune(s)
Tune-78481-CR05.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-78481-CR05.ps 45342 PostScript
Tune-78481-CR05.txt 2380 Plain-text file with the extracted tune(s)
Tune-78481-get.log 5149 Log file, useful mostly for debugging
These files should be available for 24 hours.