Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1760/24FavouriteDances_1779_Straight.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8155-24FavouriteDances_1779_Straight.ps) >>/Users/jc/w/tmp/Tune-8155-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1760/24FavouriteDances_1779_Straight.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-8155-24FavouriteDances_1779_Straight.abc 168 ABC music file with the extracted tune(s)
Tune-8155-24FavouriteDances_1779_Straight.ps 6 PostScript
Tune-8155-24FavouriteDances_1779_Straight.txt 168 Plain-text file with the extracted tune(s)
Tune-8155-get.log 4509 Log file, useful mostly for debugging
Tune-81559-Dash_to_Portobello.abc 421 ABC music file with the extracted tune(s)
Tune-81559-Dash_to_Portobello.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-81559-Dash_to_Portobello.ps 35369 PostScript
Tune-81559-Dash_to_Portobello.txt 421 Plain-text file with the extracted tune(s)
Tune-81559-get.log 5417 Log file, useful mostly for debugging
These files should be available for 24 hours.