Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MMM2/Kerr_MM3-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4429-Kerr_MM3-V1.ps) >>/Users/jc/w/tmp/Tune-4429-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MMM2/Kerr_MM3-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
Coll_44291.log 288545 Log file, useful mostly for debugging
Coll_44293.log 887990 Log file, useful mostly for debugging
Coll_44298.log 1191021 Log file, useful mostly for debugging
Coll_44299.log 273090 Log file, useful mostly for debugging
Tune-4429-Kerr_MM3-V1.abc 148 ABC music file with the extracted tune(s)
Tune-4429-Kerr_MM3-V1.ps 6 PostScript
Tune-4429-Kerr_MM3-V1.txt 148 Plain-text file with the extracted tune(s)
Tune-4429-get.log 4081 Log file, useful mostly for debugging
Tune-44299-24CountryDances_1809_Cahusac_AK.abc 183 ABC music file with the extracted tune(s)
Tune-44299-24CountryDances_1809_Cahusac_AK.pdf 2217 Portable Data Format
Tune-44299-24CountryDances_1809_Cahusac_AK.ps 6 PostScript
Tune-44299-24CountryDances_1809_Cahusac_AK.txt 183 Plain-text file with the extracted tune(s)
Tune-44299-get.log 5583 Log file, useful mostly for debugging
These files should be available for 24 hours.