Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/abc1/CSRHW-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8088-CSRHW-abc1.ps) >>/Users/jc/w/tmp/Tune-8088-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/abc1/CSRHW-abc1.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-8088-CSRHW-abc1.abc 147 ABC music file with the extracted tune(s)
Tune-8088-CSRHW-abc1.ps 6 PostScript
Tune-8088-CSRHW-abc1.txt 147 Plain-text file with the extracted tune(s)
Tune-8088-get.log 8780 Log file, useful mostly for debugging
Tune-80880-get.log 1407 Log file, useful mostly for debugging
Tune-80884-Brewer_NewInstructionsForTheClarinet.abc 173 ABC music file with the extracted tune(s)
Tune-80884-Brewer_NewInstructionsForTheClarinet.ps 6 PostScript
Tune-80884-Brewer_NewInstructionsForTheClarinet.txt 173 Plain-text file with the extracted tune(s)
Tune-80884-get.log 4662 Log file, useful mostly for debugging
Tune-80885-get.log 1341 Log file, useful mostly for debugging
Tune-80889-get.log 1277 Log file, useful mostly for debugging
These files should be available for 24 hours.