Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1780/CaledonianCountryDances.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7839-CaledonianCountryDances.ps) >>/Users/jc/w/tmp/Tune-7839-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1780/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_7839.log 280611 Log file, useful mostly for debugging
Tune-7839-CaledonianCountryDances.abc 160 ABC music file with the extracted tune(s)
Tune-7839-CaledonianCountryDances.ps 6 PostScript
Tune-7839-CaledonianCountryDances.txt 160 Plain-text file with the extracted tune(s)
Tune-7839-get.log 4337 Log file, useful mostly for debugging
Tune-78392-24CountryDances_1808_Goulding_PD.abc 170 ABC music file with the extracted tune(s)
Tune-78392-24CountryDances_1808_Goulding_PD.ps 6 PostScript
Tune-78392-24CountryDances_1808_Goulding_PD.txt 170 Plain-text file with the extracted tune(s)
Tune-78392-HibernianMuse-V1.abc 153 ABC music file with the extracted tune(s)
Tune-78392-HibernianMuse-V1.ps 6 PostScript
Tune-78392-HibernianMuse-V1.txt 153 Plain-text file with the extracted tune(s)
Tune-78392-get.log 8693 Log file, useful mostly for debugging
Tune-78397-get.log 4760 Log file, useful mostly for debugging
These files should be available for 24 hours.