Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1805/CDfNH1783.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4679-CDfNH1783.ps) >>/Users/jc/w/tmp/Tune-4679-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1805/CDfNH1783.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-4679-CDfNH1783.abc 146 ABC music file with the extracted tune(s)
Tune-4679-CDfNH1783.ps 6 PostScript
Tune-4679-CDfNH1783.txt 146 Plain-text file with the extracted tune(s)
Tune-4679-get.log 4047 Log file, useful mostly for debugging
Tune-46792-252_Love_for_Ever.abc 757 ABC music file with the extracted tune(s)
Tune-46792-252_Love_for_Ever.ps 34460 PostScript
Tune-46792-252_Love_for_Ever.txt 757 Plain-text file with the extracted tune(s)
Tune-46792-get.log 4734 Log file, useful mostly for debugging
Tune-46793-1812_Wilson_Harmony_FourNewCountryDances.abc 177 ABC music file with the extracted tune(s)
Tune-46793-1812_Wilson_Harmony_FourNewCountryDances.pdf 2217 Portable Data Format
Tune-46793-1812_Wilson_Harmony_FourNewCountryDances.ps 6 PostScript
Tune-46793-1812_Wilson_Harmony_FourNewCountryDances.txt 177 Plain-text file with the extracted tune(s)
Tune-46793-get.log 5754 Log file, useful mostly for debugging
Tune-46796-263_Midnight_Ramble.abc 684 ABC music file with the extracted tune(s)
Tune-46796-263_Midnight_Ramble.pdf 12230 Portable Data Format
Tune-46796-263_Midnight_Ramble.ps 33895 PostScript
Tune-46796-263_Midnight_Ramble.txt 684 Plain-text file with the extracted tune(s)
Tune-46796-get.log 5585 Log file, useful mostly for debugging
Tune-46798-get.log 4195 Log file, useful mostly for debugging
These files should be available for 24 hours.