Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1766/Kerr_MM1-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4986-Kerr_MM1-V2.ps) >>/Users/jc/w/tmp/Tune-4986-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1766/Kerr_MM1-V2.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_49869.log 129903 Log file, useful mostly for debugging
Find_49867.log 1511 Log file, useful mostly for debugging
Form_49862.log 1014 Log file, useful mostly for debugging
Tune-4986-Kerr_MM1-V2.abc 148 ABC music file with the extracted tune(s)
Tune-4986-Kerr_MM1-V2.ps 6 PostScript
Tune-4986-Kerr_MM1-V2.txt 148 Plain-text file with the extracted tune(s)
Tune-4986-get.log 5416 Log file, useful mostly for debugging
Tune-49862-CaledonianMusicalRepository_1811.abc 169 ABC music file with the extracted tune(s)
Tune-49862-CaledonianMusicalRepository_1811.pdf 2217 Portable Data Format
Tune-49862-CaledonianMusicalRepository_1811.ps 6 PostScript
Tune-49862-CaledonianMusicalRepository_1811.txt 169 Plain-text file with the extracted tune(s)
Tune-49862-get.log 6941 Log file, useful mostly for debugging
These files should be available for 24 hours.