pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-68592-10211_Swiss_Guards_March.ps) >>/Users/jc/w/tmp/Tune-68592-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP1/10211_Swiss_Guards_March.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-68592-10211_Swiss_Guards_March.abc 1403 ABC music file with the extracted tune(s)
Tune-68592-10211_Swiss_Guards_March.ps 41973 PostScript
Tune-68592-10211_Swiss_Guards_March.txt 1403 Plain-text file with the extracted tune(s)
Tune-68592-get.log 5043 Log file, useful mostly for debugging
These files should be available for 24 hours.