Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/jpg/LondonMagazine.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3223-LondonMagazine.ps) >>/Users/jc/w/tmp/Tune-3223-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/jpg/LondonMagazine.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-3223-24FavouriteDances_1779_Straight.abc 168 ABC music file with the extracted tune(s)
Tune-3223-24FavouriteDances_1779_Straight.pdf 2217 Portable Data Format
Tune-3223-24FavouriteDances_1779_Straight.ps 6 PostScript
Tune-3223-24FavouriteDances_1779_Straight.txt 168 Plain-text file with the extracted tune(s)
Tune-3223-LondonMagazine.abc 150 ABC music file with the extracted tune(s)
Tune-3223-LondonMagazine.ps 6 PostScript
Tune-3223-LondonMagazine.txt 150 Plain-text file with the extracted tune(s)
Tune-3223-get.log 9610 Log file, useful mostly for debugging
Tune-32231-LondonMagazine.abc 151 ABC music file with the extracted tune(s)
Tune-32231-LondonMagazine.ps 6 PostScript
Tune-32231-LondonMagazine.txt 151 Plain-text file with the extracted tune(s)
Tune-32231-get.log 4077 Log file, useful mostly for debugging
Tune-32238-24CountryDances_1779_Thompson.abc 166 ABC music file with the extracted tune(s)
Tune-32238-24CountryDances_1779_Thompson.txt 166 Plain-text file with the extracted tune(s)
Tune-32238-get.log 8874 Log file, useful mostly for debugging
Tune-32239-Urbani_Liston_1800.abc 155 ABC music file with the extracted tune(s)
Tune-32239-Urbani_Liston_1800.ps 6 PostScript
Tune-32239-Urbani_Liston_1800.txt 155 Plain-text file with the extracted tune(s)
Tune-32239-get.log 4282 Log file, useful mostly for debugging
These files should be available for 24 hours.