Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book04/AbrahamMackintosh.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1797-AbrahamMackintosh.ps) >>/Users/jc/w/tmp/Tune-1797-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book04/AbrahamMackintosh.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-1797-AbrahamMackintosh.abc 156 ABC music file with the extracted tune(s)
Tune-1797-AbrahamMackintosh.ps 6 PostScript
Tune-1797-AbrahamMackintosh.txt 156 Plain-text file with the extracted tune(s)
Tune-1797-get.log 8244 Log file, useful mostly for debugging
Tune-17970-get.log 7425 Log file, useful mostly for debugging
Tune-17973-get.log 3916 Log file, useful mostly for debugging
Tune-17974-Kerr_MM2-V1.abc 153 ABC music file with the extracted tune(s)
Tune-17974-Kerr_MM2-V1.pdf 2217 Portable Data Format
Tune-17974-Kerr_MM2-V1.ps 6 PostScript
Tune-17974-Kerr_MM2-V1.txt 153 Plain-text file with the extracted tune(s)
Tune-17974-get.log 9142 Log file, useful mostly for debugging
Tune-17977-get.log 5483 Log file, useful mostly for debugging
Tune-17978-get.log 4566 Log file, useful mostly for debugging
These files should be available for 24 hours.