pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-69777-20181_Favorite_Scotch_March.ps) >>/Users/jc/w/tmp/Tune-69777-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/20181_Favorite_Scotch_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
Coll_69777.log 343340 Log file, useful mostly for debugging
Tune-69777-20181_Favorite_Scotch_March.abc 2509 ABC music file with the extracted tune(s)
Tune-69777-20181_Favorite_Scotch_March.ps 61012 PostScript
Tune-69777-20181_Favorite_Scotch_March.txt 2509 Plain-text file with the extracted tune(s)
Tune-69777-get.log 5210 Log file, useful mostly for debugging
These files should be available for 24 hours.