Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book52/MSRPB.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9955-MSRPB.ps) >>/Users/jc/w/tmp/Tune-9955-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book52/MSRPB.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_99551.log 161017 Log file, useful mostly for debugging
Tune-9955-20402_Coquette.abc 649 ABC music file with the extracted tune(s)
Tune-9955-20402_Coquette.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-9955-20402_Coquette.ps 34470 PostScript
Tune-9955-20402_Coquette.txt 649 Plain-text file with the extracted tune(s)
Tune-9955-MSRPB.abc 144 ABC music file with the extracted tune(s)
Tune-9955-MSRPB.ps 6 PostScript
Tune-9955-MSRPB.txt 144 Plain-text file with the extracted tune(s)
Tune-9955-get.log 17838 Log file, useful mostly for debugging
Tune-99551-get.log 4502 Log file, useful mostly for debugging
Tune-99552-get.log 4801 Log file, useful mostly for debugging
Tune-99554-get.log 8536 Log file, useful mostly for debugging
Tune-99556-get.log 5549 Log file, useful mostly for debugging
Tune-99557-get.log 7656 Log file, useful mostly for debugging
These files should be available for 24 hours.