Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1770/FOEFDA.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8577-FOEFDA.ps) >>/Users/jc/w/tmp/Tune-8577-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1770/FOEFDA.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-8577-FOEFDA.abc 143 ABC music file with the extracted tune(s)
Tune-8577-FOEFDA.ps 6 PostScript
Tune-8577-FOEFDA.txt 143 Plain-text file with the extracted tune(s)
Tune-8577-get.log 3980 Log file, useful mostly for debugging
Tune-85772-get.log 5437 Log file, useful mostly for debugging
Tune-85774-AMHSI-abc1.abc 147 ABC music file with the extracted tune(s)
Tune-85774-AMHSI-abc1.ps 6 PostScript
Tune-85774-AMHSI-abc1.txt 147 Plain-text file with the extracted tune(s)
Tune-85774-get.log 3991 Log file, useful mostly for debugging
Tune-85778-CSGBT_1794-V2.abc 150 ABC music file with the extracted tune(s)
Tune-85778-CSGBT_1794-V2.ps 6 PostScript
Tune-85778-CSGBT_1794-V2.txt 150 Plain-text file with the extracted tune(s)
Tune-85778-get.log 4054 Log file, useful mostly for debugging
Tune-85779-get.log 3548 Log file, useful mostly for debugging
These files should be available for 24 hours.