Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/SocialDances2002/BotCDaSS.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4976-BotCDaSS.ps) >>/Users/jc/w/tmp/Tune-4976-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SocialDances2002/BotCDaSS.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-4976-BotCDaSS.abc 157 ABC music file with the extracted tune(s)
Tune-4976-BotCDaSS.ps 6 PostScript
Tune-4976-BotCDaSS.txt 157 Plain-text file with the extracted tune(s)
Tune-4976-Thompson_V3_1766-1772_FTM.abc 168 ABC music file with the extracted tune(s)
Tune-4976-Thompson_V3_1766-1772_FTM.txt 168 Plain-text file with the extracted tune(s)
Tune-4976-get.log 7576 Log file, useful mostly for debugging
Tune-49761-11081-Circus_Tune-V1.abc 3137 ABC music file with the extracted tune(s)
Tune-49761-11081-Circus_Tune-V1.pdf 71243 Portable Data Format
Tune-49761-11081-Circus_Tune-V1.ps 61389 PostScript
Tune-49761-11081-Circus_Tune-V1.txt 3137 Plain-text file with the extracted tune(s)
Tune-49761-get.log 5825 Log file, useful mostly for debugging
Tune-49763-get.log 5171 Log file, useful mostly for debugging
Tune-49767-24CountryDances_1794_Preston.abc 167 ABC music file with the extracted tune(s)
Tune-49767-24CountryDances_1794_Preston.ps 6 PostScript
Tune-49767-24CountryDances_1794_Preston.txt 167 Plain-text file with the extracted tune(s)
Tune-49767-get.log 4502 Log file, useful mostly for debugging
These files should be available for 24 hours.