pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-56658-LordMonksMarchThe_PLFD1657_151.ps) >>/Users/jc/w/tmp/Tune-56658-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Playford/LordMonksMarchThe_PLFD1657_151.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_56658.log 472408 Log file, useful mostly for debugging
Tune-56658-LordMonksMarchThe_PLFD1657_151.abc 433 ABC music file with the extracted tune(s)
Tune-56658-LordMonksMarchThe_PLFD1657_151.ps 35430 PostScript
Tune-56658-LordMonksMarchThe_PLFD1657_151.txt 433 Plain-text file with the extracted tune(s)
Tune-56658-get.log 4992 Log file, useful mostly for debugging
These files should be available for 24 hours.