Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1781/slurs.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-34265-slurs.ps) >>/Users/jc/w/tmp/Tune-34265-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1781/slurs.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-34265-10371_Greenwich_Hill.abc 535 ABC music file with the extracted tune(s)
Tune-34265-10371_Greenwich_Hill.pdf 13261 Portable Data Format
Tune-34265-10371_Greenwich_Hill.ps 34815 PostScript
Tune-34265-10371_Greenwich_Hill.txt 535 Plain-text file with the extracted tune(s)
Tune-34265-get.log 9567 Log file, useful mostly for debugging
Tune-34265-slurs.abc 142 ABC music file with the extracted tune(s)
Tune-34265-slurs.ps 6 PostScript
Tune-34265-slurs.txt 142 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.