Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1793/SocialDances2002.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3910-SocialDances2002.ps) >>/Users/jc/w/tmp/Tune-3910-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1793/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-3910-SocialDances2002.abc 153 ABC music file with the extracted tune(s)
Tune-3910-SocialDances2002.ps 6 PostScript
Tune-3910-SocialDances2002.txt 153 Plain-text file with the extracted tune(s)
Tune-3910-get.log 4190 Log file, useful mostly for debugging
Tune-39103-Kohlers2.abc 145 ABC music file with the extracted tune(s)
Tune-39103-Kohlers2.ps 6 PostScript
Tune-39103-Kohlers2.txt 145 Plain-text file with the extracted tune(s)
Tune-39103-get.log 4072 Log file, useful mostly for debugging
Tune-39104-Pat_Shaw_NewWineInOldBottles.abc 165 ABC music file with the extracted tune(s)
Tune-39104-Pat_Shaw_NewWineInOldBottles.ps 6 PostScript
Tune-39104-Pat_Shaw_NewWineInOldBottles.txt 165 Plain-text file with the extracted tune(s)
Tune-39104-get.log 4371 Log file, useful mostly for debugging
Tune-39107-get.log 3580 Log file, useful mostly for debugging
Tune-39109-WilliamShepherdsCollections.abc 164 ABC music file with the extracted tune(s)
Tune-39109-WilliamShepherdsCollections.ps 6 PostScript
Tune-39109-WilliamShepherdsCollections.txt 164 Plain-text file with the extracted tune(s)
Tune-39109-get.log 197794 Log file, useful mostly for debugging
These files should be available for 24 hours.