Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1770/MSRPB.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4616-MSRPB.ps) >>/Users/jc/w/tmp/Tune-4616-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1770/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_46162.log 1619066 Log file, useful mostly for debugging
Coll_46164.log 291809 Log file, useful mostly for debugging
Tune-4616-MSRPB.abc 142 ABC music file with the extracted tune(s)
Tune-4616-MSRPB.ps 6 PostScript
Tune-4616-MSRPB.txt 142 Plain-text file with the extracted tune(s)
Tune-4616-get.log 3959 Log file, useful mostly for debugging
Tune-46160-get.log 5176 Log file, useful mostly for debugging
Tune-46161-get.log 3658 Log file, useful mostly for debugging
Tune-46163-get.log 6990 Log file, useful mostly for debugging
Tune-46167-SCD_RoyGoldring_14SocialDancesFor2000.abc 174 ABC music file with the extracted tune(s)
Tune-46167-SCD_RoyGoldring_14SocialDancesFor2000.ps 6 PostScript
Tune-46167-SCD_RoyGoldring_14SocialDancesFor2000.txt 174 Plain-text file with the extracted tune(s)
Tune-46167-get.log 9191 Log file, useful mostly for debugging
These files should be available for 24 hours.