Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/cache/BotCDaSS.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4148-BotCDaSS.ps) >>/Users/jc/w/tmp/Tune-4148-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/cache/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-4148-BotCDaSS.abc 146 ABC music file with the extracted tune(s)
Tune-4148-BotCDaSS.ps 6 PostScript
Tune-4148-BotCDaSS.txt 146 Plain-text file with the extracted tune(s)
Tune-4148-get.log 16926 Log file, useful mostly for debugging
Tune-41480-get.log 4304 Log file, useful mostly for debugging
Tune-41481-get.log 9632 Log file, useful mostly for debugging
Tune-41482-get.log 14661 Log file, useful mostly for debugging
Tune-41483-get.log 4210 Log file, useful mostly for debugging
Tune-41484-get.log 4362 Log file, useful mostly for debugging
Tune-41485-get.log 16360 Log file, useful mostly for debugging
Tune-41487-get.log 11910 Log file, useful mostly for debugging
Tune-41488-get.log 8103 Log file, useful mostly for debugging
These files should be available for 24 hours.