Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Pioneer/MMM1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6303-MMM1.ps) >>/Users/jc/w/tmp/Tune-6303-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Pioneer/MMM1.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-6303-MMM1.abc 144 ABC music file with the extracted tune(s)
Tune-6303-MMM1.ps 6 PostScript
Tune-6303-MMM1.txt 144 Plain-text file with the extracted tune(s)
Tune-6303-get.log 3956 Log file, useful mostly for debugging
Tune-63031-Wood_and_Married_and_A-G-16-3.abc 502 ABC music file with the extracted tune(s)
Tune-63031-Wood_and_Married_and_A-G-16-3.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-63031-Wood_and_Married_and_A-G-16-3.ps 35265 PostScript
Tune-63031-Wood_and_Married_and_A-G-16-3.txt 502 Plain-text file with the extracted tune(s)
Tune-63031-get.log 6132 Log file, useful mostly for debugging
Tune-63034-Kerr_MM2-V2.abc 147 ABC music file with the extracted tune(s)
Tune-63034-Kerr_MM2-V2.ps 6 PostScript
Tune-63034-Kerr_MM2-V2.txt 147 Plain-text file with the extracted tune(s)
Tune-63034-get.log 4004 Log file, useful mostly for debugging
These files should be available for 24 hours.