Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/WAtC/SocialDances2002.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9325-SocialDances2002.ps) >>/Users/jc/w/tmp/Tune-9325-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/WAtC/SocialDances2002.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-9325-SocialDances2002.abc 153 ABC music file with the extracted tune(s)
Tune-9325-SocialDances2002.ps 6 PostScript
Tune-9325-SocialDances2002.txt 153 Plain-text file with the extracted tune(s)
Tune-9325-get.log 4194 Log file, useful mostly for debugging
Tune-93250-Gow-CSR2-abc1.abc 152 ABC music file with the extracted tune(s)
Tune-93250-Gow-CSR2-abc1.ps 6 PostScript
Tune-93250-Gow-CSR2-abc1.txt 152 Plain-text file with the extracted tune(s)
Tune-93250-get.log 4066 Log file, useful mostly for debugging
Tune-93254-get.log 15105 Log file, useful mostly for debugging
Tune-93255-get.log 4971 Log file, useful mostly for debugging
Tune-93256-get.log 10887 Log file, useful mostly for debugging
Tune-93258-get.log 4624 Log file, useful mostly for debugging
Tune-93259-MichaelDabney_12Minuets12Dances-1760-V1.abc 176 ABC music file with the extracted tune(s)
Tune-93259-MichaelDabney_12Minuets12Dances-1760-V1.txt 176 Plain-text file with the extracted tune(s)
Tune-93259-get.log 3706 Log file, useful mostly for debugging
These files should be available for 24 hours.