Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1802/FARNE_Anonymous2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1644-FARNE_Anonymous2.ps) >>/Users/jc/w/tmp/Tune-1644-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1802/FARNE_Anonymous2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Find_16447.log 1559 Log file, useful mostly for debugging
Tune-1644-2138_Charlie_Stuart.abc 438 ABC music file with the extracted tune(s)
Tune-1644-2138_Charlie_Stuart.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-1644-2138_Charlie_Stuart.ps 34554 PostScript
Tune-1644-2138_Charlie_Stuart.txt 438 Plain-text file with the extracted tune(s)
Tune-1644-FARNE_Anonymous2.abc 153 ABC music file with the extracted tune(s)
Tune-1644-FARNE_Anonymous2.ps 6 PostScript
Tune-1644-FARNE_Anonymous2.txt 153 Plain-text file with the extracted tune(s)
Tune-1644-get.log 9629 Log file, useful mostly for debugging
Tune-16442-10491-001.svg 42224 Scalable Vector Graphics format
Tune-16442-10491.abc 1311 ABC music file with the extracted tune(s)
Tune-16442-10491.txt 1311 Plain-text file with the extracted tune(s)
Tune-16442-24CountryDances_1778_Thompson.abc 166 ABC music file with the extracted tune(s)
Tune-16442-24CountryDances_1778_Thompson.ps 6 PostScript
Tune-16442-24CountryDances_1778_Thompson.txt 166 Plain-text file with the extracted tune(s)
Tune-16442-get.log 12016 Log file, useful mostly for debugging
These files should be available for 24 hours.