Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MMM1/Gow-CSR4-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9723-Gow-CSR4-abc2.ps) >>/Users/jc/w/tmp/Tune-9723-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MMM1/Gow-CSR4-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-9723-Gow-CSR4-abc2.abc 150 ABC music file with the extracted tune(s)
Tune-9723-Gow-CSR4-abc2.ps 6 PostScript
Tune-9723-Gow-CSR4-abc2.txt 150 Plain-text file with the extracted tune(s)
Tune-9723-get.log 4127 Log file, useful mostly for debugging
Tune-97231-Gow-CSR-abc2.abc 151 ABC music file with the extracted tune(s)
Tune-97231-Gow-CSR-abc2.pdf 2217 Portable Data Format
Tune-97231-Gow-CSR-abc2.ps 6 PostScript
Tune-97231-Gow-CSR-abc2.txt 151 Plain-text file with the extracted tune(s)
Tune-97231-get.log 4954 Log file, useful mostly for debugging
Tune-97235-24CountryDances_1781_Skillern.abc 172 ABC music file with the extracted tune(s)
Tune-97235-24CountryDances_1781_Skillern.txt 172 Plain-text file with the extracted tune(s)
Tune-97235-get.log 3564 Log file, useful mostly for debugging
These files should be available for 24 hours.