Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1812/AMHSI_abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8965-AMHSI_abc2.ps) >>/Users/jc/w/tmp/Tune-8965-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1812/AMHSI_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-8965-AMHSI_abc2.abc 147 ABC music file with the extracted tune(s)
Tune-8965-AMHSI_abc2.ps 6 PostScript
Tune-8965-AMHSI_abc2.txt 147 Plain-text file with the extracted tune(s)
Tune-8965-get.log 4064 Log file, useful mostly for debugging
Tune-89650-GoldenBookOfFavoriteSongs1.abc 163 ABC music file with the extracted tune(s)
Tune-89650-GoldenBookOfFavoriteSongs1.pdf 2217 Portable Data Format
Tune-89650-GoldenBookOfFavoriteSongs1.ps 6 PostScript
Tune-89650-GoldenBookOfFavoriteSongs1.txt 163 Plain-text file with the extracted tune(s)
Tune-89650-get.log 5350 Log file, useful mostly for debugging
Tune-89651-get.log 1412 Log file, useful mostly for debugging
Tune-89656-get.log 1401 Log file, useful mostly for debugging
These files should be available for 24 hours.