Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1772/BotCDaSS.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-57311-BotCDaSS.ps) >>/Users/jc/w/tmp/Tune-57311-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1772/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-57311-14_Bread_and_Cheese.abc 925 ABC music file with the extracted tune(s)
Tune-57311-14_Bread_and_Cheese.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-57311-14_Bread_and_Cheese.ps 34483 PostScript
Tune-57311-14_Bread_and_Cheese.txt 925 Plain-text file with the extracted tune(s)
Tune-57311-BotCDaSS.abc 145 ABC music file with the extracted tune(s)
Tune-57311-BotCDaSS.ps 6 PostScript
Tune-57311-BotCDaSS.txt 145 Plain-text file with the extracted tune(s)
Tune-57311-get.log 9525 Log file, useful mostly for debugging
These files should be available for 24 hours.