Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/hdr/_.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8109-_.ps) >>/Users/jc/w/tmp/Tune-8109-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/hdr/_.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_81097.log 151266 Log file, useful mostly for debugging
Tune-8109-_.abc 137 ABC music file with the extracted tune(s)
Tune-8109-_.ps 6 PostScript
Tune-8109-_.txt 137 Plain-text file with the extracted tune(s)
Tune-8109-get.log 7767 Log file, useful mostly for debugging
Tune-81093-Brewer_NewInstructionsForTheClarinet.abc 174 ABC music file with the extracted tune(s)
Tune-81093-Brewer_NewInstructionsForTheClarinet.ps 6 PostScript
Tune-81093-Brewer_NewInstructionsForTheClarinet.txt 174 Plain-text file with the extracted tune(s)
Tune-81093-get.log 4545 Log file, useful mostly for debugging
Tune-81094-get.log 4459 Log file, useful mostly for debugging
Tune-81095-get.log 4908 Log file, useful mostly for debugging
These files should be available for 24 hours.