Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1791/JamesJohnson_ScotsMusicalMuseumV4-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9606-JamesJohnson_ScotsMusicalMuseumV4-V2.ps) >>/Users/jc/w/tmp/Tune-9606-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1791/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_96069.log 291809 Log file, useful mostly for debugging
Tune-9606-JamesJohnson_ScotsMusicalMuseumV4-V2.abc 173 ABC music file with the extracted tune(s)
Tune-9606-JamesJohnson_ScotsMusicalMuseumV4-V2.ps 6 PostScript
Tune-9606-JamesJohnson_ScotsMusicalMuseumV4-V2.txt 173 Plain-text file with the extracted tune(s)
Tune-9606-get.log 4614 Log file, useful mostly for debugging
Tune-96062-111_the_Boyne_Water.abc 607 ABC music file with the extracted tune(s)
Tune-96062-111_the_Boyne_Water.pdf 11516 Portable Data Format
Tune-96062-111_the_Boyne_Water.ps 33872 PostScript
Tune-96062-111_the_Boyne_Water.txt 607 Plain-text file with the extracted tune(s)
Tune-96062-get.log 5586 Log file, useful mostly for debugging
Tune-96063-11141_Contra_Dance.abc 1655 ABC music file with the extracted tune(s)
Tune-96063-11141_Contra_Dance.ps 43672 PostScript
Tune-96063-11141_Contra_Dance.txt 1655 Plain-text file with the extracted tune(s)
Tune-96063-get.log 4864 Log file, useful mostly for debugging
These files should be available for 24 hours.