Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MM2/Kerr_MM4-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9623-Kerr_MM4-V1.ps) >>/Users/jc/w/tmp/Tune-9623-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MM2/Kerr_MM4-V1.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-9623-Kerr_MM4-V1.abc 147 ABC music file with the extracted tune(s)
Tune-9623-Kerr_MM4-V1.ps 6 PostScript
Tune-9623-Kerr_MM4-V1.txt 147 Plain-text file with the extracted tune(s)
Tune-9623-get.log 4083 Log file, useful mostly for debugging
Tune-96235-24CountryDances_1809_Cahusac_AK.abc 167 ABC music file with the extracted tune(s)
Tune-96235-24CountryDances_1809_Cahusac_AK.ps 6 PostScript
Tune-96235-24CountryDances_1809_Cahusac_AK.txt 167 Plain-text file with the extracted tune(s)
Tune-96235-get.log 7951 Log file, useful mostly for debugging
Tune-96236-get.log 6157 Log file, useful mostly for debugging
These files should be available for 24 hours.