Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1812/dance.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5116-dance.ps) >>/Users/jc/w/tmp/Tune-5116-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1812/dance.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-5116-dance.abc 142 ABC music file with the extracted tune(s)
Tune-5116-dance.ps 6 PostScript
Tune-5116-dance.txt 142 Plain-text file with the extracted tune(s)
Tune-5116-get.log 3959 Log file, useful mostly for debugging
Tune-51160-get.log 4479 Log file, useful mostly for debugging
Tune-51161-get.log 5551 Log file, useful mostly for debugging
Tune-51162-get.log 1431 Log file, useful mostly for debugging
Tune-51163-get.log 5226 Log file, useful mostly for debugging
Tune-51167-Jean_Henry_dAnglebert_PdC2.abc 165 ABC music file with the extracted tune(s)
Tune-51167-Jean_Henry_dAnglebert_PdC2.pdf 2217 Portable Data Format
Tune-51167-Jean_Henry_dAnglebert_PdC2.ps 6 PostScript
Tune-51167-Jean_Henry_dAnglebert_PdC2.txt 165 Plain-text file with the extracted tune(s)
Tune-51167-get.log 18540 Log file, useful mostly for debugging
Tune-51168-get.log 7972 Log file, useful mostly for debugging
Tune-51169-get.log 4128 Log file, useful mostly for debugging
These files should be available for 24 hours.