Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/jpg/Gow-CSR2-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9338-Gow-CSR2-abc1.ps) >>/Users/jc/w/tmp/Tune-9338-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/jpg/Gow-CSR2-abc1.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-9338-Gow-CSR2-abc1.abc 149 ABC music file with the extracted tune(s)
Tune-9338-Gow-CSR2-abc1.ps 6 PostScript
Tune-9338-Gow-CSR2-abc1.txt 149 Plain-text file with the extracted tune(s)
Tune-9338-get.log 4123 Log file, useful mostly for debugging
Tune-93382-24CountryDances_1780_Skillern.abc 166 ABC music file with the extracted tune(s)
Tune-93382-24CountryDances_1780_Skillern.ps 6 PostScript
Tune-93382-24CountryDances_1780_Skillern.txt 166 Plain-text file with the extracted tune(s)
Tune-93382-get.log 4392 Log file, useful mostly for debugging
Tune-93387-book_of_rights.abc 151 ABC music file with the extracted tune(s)
Tune-93387-book_of_rights.txt 151 Plain-text file with the extracted tune(s)
Tune-93387-get.log 3254 Log file, useful mostly for debugging
These files should be available for 24 hours.