Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1758/MSRPB.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4572-MSRPB.ps) >>/Users/jc/w/tmp/Tune-4572-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1758/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_45720.log 296011 Log file, useful mostly for debugging
Tune-4572-MSRPB.abc 142 ABC music file with the extracted tune(s)
Tune-4572-MSRPB.ps 6 PostScript
Tune-4572-MSRPB.txt 142 Plain-text file with the extracted tune(s)
Tune-4572-get.log 9470 Log file, useful mostly for debugging
Tune-45722-get.log 8810 Log file, useful mostly for debugging
Tune-45723-get.log 5325 Log file, useful mostly for debugging
Tune-45724-get.log 5408 Log file, useful mostly for debugging
Tune-45725-get.log 4456 Log file, useful mostly for debugging
Tune-45726-get.log 4600 Log file, useful mostly for debugging
Tune-45727-get.log 5412 Log file, useful mostly for debugging
Tune-45729-get.log 4124 Log file, useful mostly for debugging
These files should be available for 24 hours.