Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/abc1/newpage.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4387-newpage.ps) >>/Users/jc/w/tmp/Tune-4387-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/abc1/newpage.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-4387-get.log 4005 Log file, useful mostly for debugging
Tune-4387-newpage.abc 144 ABC music file with the extracted tune(s)
Tune-4387-newpage.ps 6 PostScript
Tune-4387-newpage.txt 144 Plain-text file with the extracted tune(s)
Tune-43871-get.log 3983 Log file, useful mostly for debugging
Tune-43874-AbrahamMackintosh.abc 154 ABC music file with the extracted tune(s)
Tune-43874-AbrahamMackintosh.pdf 2217 Portable Data Format
Tune-43874-AbrahamMackintosh.ps 6 PostScript
Tune-43874-AbrahamMackintosh.txt 154 Plain-text file with the extracted tune(s)
Tune-43874-get.log 5085 Log file, useful mostly for debugging
Tune-43877-MrKynastonsFamousDance.abc 159 ABC music file with the extracted tune(s)
Tune-43877-MrKynastonsFamousDance.ps 6 PostScript
Tune-43877-MrKynastonsFamousDance.txt 159 Plain-text file with the extracted tune(s)
Tune-43877-get.log 4364 Log file, useful mostly for debugging
Tune-43878-dance.abc 142 ABC music file with the extracted tune(s)
Tune-43878-dance.ps 6 PostScript
Tune-43878-dance.txt 142 Plain-text file with the extracted tune(s)
Tune-43878-get.log 4007 Log file, useful mostly for debugging
These files should be available for 24 hours.