Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1812/blank.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4297-blank.ps) >>/Users/jc/w/tmp/Tune-4297-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1812/blank.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_42970.log 157117 Log file, useful mostly for debugging
Tune-4297-blank.abc 142 ABC music file with the extracted tune(s)
Tune-4297-blank.ps 6 PostScript
Tune-4297-blank.txt 142 Plain-text file with the extracted tune(s)
Tune-4297-get.log 8233 Log file, useful mostly for debugging
Tune-42971-1271_the_Tree_In_the_Wood.abc 2673 ABC music file with the extracted tune(s)
Tune-42971-1271_the_Tree_In_the_Wood.txt 2673 Plain-text file with the extracted tune(s)
Tune-42971-get.log 7860 Log file, useful mostly for debugging
Tune-42972-get.log 12504 Log file, useful mostly for debugging
Tune-42974-get.log 6784 Log file, useful mostly for debugging
Tune-42975-get.log 5339 Log file, useful mostly for debugging
Tune-42976-get.log 4950 Log file, useful mostly for debugging
Tune-42977-get.log 3320 Log file, useful mostly for debugging
Tune-42978-EliasHowe_MusiciansCompanionP1-1842-V1.abc 176 ABC music file with the extracted tune(s)
Tune-42978-EliasHowe_MusiciansCompanionP1-1842-V1.ps 6 PostScript
Tune-42978-EliasHowe_MusiciansCompanionP1-1842-V1.txt 176 Plain-text file with the extracted tune(s)
Tune-42978-get.log 9293 Log file, useful mostly for debugging
Tune-42979-get.log 1282 Log file, useful mostly for debugging
These files should be available for 24 hours.