pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7804-20212_Nahant_March.ps) >>/Users/jc/w/tmp/Tune-7804-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/20212_Nahant_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-7804-20212_Nahant_March.abc 937 ABC music file with the extracted tune(s)
Tune-7804-20212_Nahant_March.ps 39921 PostScript
Tune-7804-20212_Nahant_March.txt 937 Plain-text file with the extracted tune(s)
Tune-7804-get.log 15058 Log file, useful mostly for debugging
Tune-78040-get.log 10586 Log file, useful mostly for debugging
Tune-78041-get.log 10260 Log file, useful mostly for debugging
Tune-78045-get.log 8305 Log file, useful mostly for debugging
Tune-78046-get.log 8059 Log file, useful mostly for debugging
Tune-78047-get.log 13625 Log file, useful mostly for debugging
Tune-78048-get.log 4383 Log file, useful mostly for debugging
Tune-78049-get.log 12876 Log file, useful mostly for debugging
These files should be available for 24 hours.