Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/abc2/MichaelDabney_12Minuets12Dances-1760-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9071-MichaelDabney_12Minuets12Dances-1760-V2.ps) >>/Users/jc/w/tmp/Tune-9071-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/abc2/MichaelDabney_12Minuets12Dances-1760-V2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_9071.log 809 Log file, useful mostly for debugging
Tune-9071-MichaelDabney_12Minuets12Dances-1760-V2.abc 176 ABC music file with the extracted tune(s)
Tune-9071-MichaelDabney_12Minuets12Dances-1760-V2.ps 6 PostScript
Tune-9071-MichaelDabney_12Minuets12Dances-1760-V2.txt 176 Plain-text file with the extracted tune(s)
Tune-9071-get.log 4673 Log file, useful mostly for debugging
Tune-90711-Tune-2080-1242_LELANDS_WALTZ.abc 180 ABC music file with the extracted tune(s)
Tune-90711-Tune-2080-1242_LELANDS_WALTZ.txt 180 Plain-text file with the extracted tune(s)
Tune-90711-get.log 3598 Log file, useful mostly for debugging
Tune-90716-Tune-99867-10291_Air_Grazioso.abc 181 ABC music file with the extracted tune(s)
Tune-90716-Tune-99867-10291_Air_Grazioso.ps 6 PostScript
Tune-90716-Tune-99867-10291_Air_Grazioso.txt 181 Plain-text file with the extracted tune(s)
Tune-90716-get.log 4292 Log file, useful mostly for debugging
These files should be available for 24 hours.