pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4251-20171_Reeds_March.ps) >>/Users/jc/w/tmp/Tune-4251-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/20171_Reeds_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_4251.log 152566 Log file, useful mostly for debugging
Coll_42519.log 166217 Log file, useful mostly for debugging
Tune-4251-20171_Reeds_March.abc 1271 ABC music file with the extracted tune(s)
Tune-4251-20171_Reeds_March.ps 44687 PostScript
Tune-4251-20171_Reeds_March.txt 1271 Plain-text file with the extracted tune(s)
Tune-4251-get.log 4884 Log file, useful mostly for debugging
Tune-42510-get.log 17273 Log file, useful mostly for debugging
Tune-42511-get.log 9628 Log file, useful mostly for debugging
Tune-42512-get.log 11261 Log file, useful mostly for debugging
Tune-42514-get.log 5030 Log file, useful mostly for debugging
Tune-42516-get.log 3650 Log file, useful mostly for debugging
Tune-42517-get.log 5528 Log file, useful mostly for debugging
These files should be available for 24 hours.