Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1777/JamesJohnson_ScotsMusicalMuseumV4-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8553-JamesJohnson_ScotsMusicalMuseumV4-V2.ps) >>/Users/jc/w/tmp/Tune-8553-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1777/JamesJohnson_ScotsMusicalMuseumV4-V2.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_85531.log 458410 Log file, useful mostly for debugging
Coll_85535.log 469610 Log file, useful mostly for debugging
Coll_85539.log 552212 Log file, useful mostly for debugging
Form_85536.log 951 Log file, useful mostly for debugging
Tune-8553-JamesJohnson_ScotsMusicalMuseumV4-V2.abc 173 ABC music file with the extracted tune(s)
Tune-8553-JamesJohnson_ScotsMusicalMuseumV4-V2.ps 6 PostScript
Tune-8553-JamesJohnson_ScotsMusicalMuseumV4-V2.txt 173 Plain-text file with the extracted tune(s)
Tune-8553-get.log 4612 Log file, useful mostly for debugging
Tune-85535-get.log 1410 Log file, useful mostly for debugging
Tune-85539-Jolly_Boy_1702_PLFD1_488_The_CP.abc 406 ABC music file with the extracted tune(s)
Tune-85539-Jolly_Boy_1702_PLFD1_488_The_CP.pdf 14134 Portable Data Format
Tune-85539-Jolly_Boy_1702_PLFD1_488_The_CP.ps 33626 PostScript
Tune-85539-Jolly_Boy_1702_PLFD1_488_The_CP.txt 406 Plain-text file with the extracted tune(s)
Tune-85539-get.log 6003 Log file, useful mostly for debugging
These files should be available for 24 hours.