Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/DftY/1808/Goulding/Goulding_TwentyFourCountryDancesForTheYear1808.abc/src"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-91535-src.ps) >>/Users/jc/w/tmp/Tune-91535-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1808/Goulding/Goulding_TwentyFourCountryDancesForTheYear1808.abc/src

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-91535-get.log 4242 Log file, useful mostly for debugging
Tune-91535-src.abc 405 ABC music file with the extracted tune(s)
Tune-91535-src.ps 6 PostScript
Tune-91535-src.txt 405 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.