Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book12/24CountryDances_1780_Skillern.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4504-24CountryDances_1780_Skillern.ps) >>/Users/jc/w/tmp/Tune-4504-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book12/24CountryDances_1780_Skillern.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_45045.log 1474826 Log file, useful mostly for debugging
Tune-4504-24CountryDances_1780_Skillern.abc 168 ABC music file with the extracted tune(s)
Tune-4504-24CountryDances_1780_Skillern.ps 6 PostScript
Tune-4504-24CountryDances_1780_Skillern.txt 168 Plain-text file with the extracted tune(s)
Tune-4504-get.log 4473 Log file, useful mostly for debugging
Tune-45040-get.log 4739 Log file, useful mostly for debugging
Tune-45040-slurs.abc 142 ABC music file with the extracted tune(s)
Tune-45040-slurs.pdf 2217 Portable Data Format
Tune-45040-slurs.ps 6 PostScript
Tune-45040-slurs.txt 142 Plain-text file with the extracted tune(s)
Tune-45041-get.log 1225 Log file, useful mostly for debugging
Tune-45042-get.log 15264 Log file, useful mostly for debugging
Tune-45045-get.log 4435 Log file, useful mostly for debugging
Tune-45046-get.log 4211 Log file, useful mostly for debugging
Tune-45047-get.log 3192 Log file, useful mostly for debugging
Tune-45048-get.log 10568 Log file, useful mostly for debugging
Tune-45048-v3tune.abc 142 ABC music file with the extracted tune(s)
Tune-45048-v3tune.txt 142 Plain-text file with the extracted tune(s)
Tune-45049-get.log 3624 Log file, useful mostly for debugging
These files should be available for 24 hours.