Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1793/CaledonianCountryDances.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-877-CaledonianCountryDances.ps) >>/Users/jc/w/tmp/Tune-877-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1793/CaledonianCountryDances.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_87702.log 247800 Log file, useful mostly for debugging
Coll_87717.log 253420 Log file, useful mostly for debugging
Coll_87728.log 400949 Log file, useful mostly for debugging
Coll_87739.log 244990 Log file, useful mostly for debugging
Coll_87750.log 249205 Log file, useful mostly for debugging
Coll_87755.log 363010 Log file, useful mostly for debugging
Coll_87761.log 247800 Log file, useful mostly for debugging
Coll_87773.log 247800 Log file, useful mostly for debugging
Coll_87784.log 136356 Log file, useful mostly for debugging
Coll_87796.log 247800 Log file, useful mostly for debugging
Tune-877-CaledonianCountryDances.abc 160 ABC music file with the extracted tune(s)
Tune-877-CaledonianCountryDances.ps 6 PostScript
Tune-877-CaledonianCountryDances.txt 160 Plain-text file with the extracted tune(s)
Tune-877-get.log 4318 Log file, useful mostly for debugging
Tune-87711-get.log 7641 Log file, useful mostly for debugging
Tune-8772-get.log 3230 Log file, useful mostly for debugging
Tune-87738-get.log 11532 Log file, useful mostly for debugging
Tune-8774-get.log 7914 Log file, useful mostly for debugging
Tune-87746-get.log 4016 Log file, useful mostly for debugging
Tune-87753-get.log 3186 Log file, useful mostly for debugging
Tune-87771-get.log 2962 Log file, useful mostly for debugging
Tune-87783-get.log 4537 Log file, useful mostly for debugging
Tune-87789-get.log 9150 Log file, useful mostly for debugging
These files should be available for 24 hours.