Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Tweed2/Gow-CSR2-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9072-Gow-CSR2-abc2.ps) >>/Users/jc/w/tmp/Tune-9072-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Tweed2/Gow-CSR2-abc2.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-9072-Gow-CSR2-abc2.abc 152 ABC music file with the extracted tune(s)
Tune-9072-Gow-CSR2-abc2.ps 6 PostScript
Tune-9072-Gow-CSR2-abc2.txt 152 Plain-text file with the extracted tune(s)
Tune-9072-get.log 4137 Log file, useful mostly for debugging
Tune-90721-Hamilton_Kerr_MM2-V1.abc 157 ABC music file with the extracted tune(s)
Tune-90721-Hamilton_Kerr_MM2-V1.pdf 2217 Portable Data Format
Tune-90721-Hamilton_Kerr_MM2-V1.ps 6 PostScript
Tune-90721-Hamilton_Kerr_MM2-V1.txt 157 Plain-text file with the extracted tune(s)
Tune-90721-get.log 5170 Log file, useful mostly for debugging
Tune-90725-24CountryDances_1813_Button_Whitaker.abc 175 ABC music file with the extracted tune(s)
Tune-90725-24CountryDances_1813_Button_Whitaker.ps 6 PostScript
Tune-90725-24CountryDances_1813_Button_Whitaker.txt 175 Plain-text file with the extracted tune(s)
Tune-90725-get.log 10418 Log file, useful mostly for debugging
These files should be available for 24 hours.