Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/SCAJMR/MSRPB.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3930-MSRPB.ps) >>/Users/jc/w/tmp/Tune-3930-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SCAJMR/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
Tune-3930-1212_Central_Will_Shine.abc 1469 ABC music file with the extracted tune(s)
Tune-3930-1212_Central_Will_Shine.ps 37935 PostScript
Tune-3930-1212_Central_Will_Shine.txt 1469 Plain-text file with the extracted tune(s)
Tune-3930-MSRPB.abc 144 ABC music file with the extracted tune(s)
Tune-3930-MSRPB.ps 6 PostScript
Tune-3930-MSRPB.txt 144 Plain-text file with the extracted tune(s)
Tune-3930-get.log 15348 Log file, useful mostly for debugging
Tune-39301-get.log 5406 Log file, useful mostly for debugging
Tune-39303-get.log 4660 Log file, useful mostly for debugging
Tune-39306-get.log 4511 Log file, useful mostly for debugging
Tune-39307-get.log 5636 Log file, useful mostly for debugging
Tune-39308-get.log 4537 Log file, useful mostly for debugging
These files should be available for 24 hours.