pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-93841-Dunkirke_1657_PLFD1_139_CP.ps) >>/Users/jc/w/tmp/Tune-93841-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Playford/Dunkirke_1657_PLFD1_139_CP.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-93841-Dunkirke_1657_PLFD1_139_CP.abc 390 ABC music file with the extracted tune(s)
Tune-93841-Dunkirke_1657_PLFD1_139_CP.ps 34273 PostScript
Tune-93841-Dunkirke_1657_PLFD1_139_CP.txt 390 Plain-text file with the extracted tune(s)
Tune-93841-get.log 4862 Log file, useful mostly for debugging
These files should be available for 24 hours.