Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1776/BB50.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8198-BB50.ps) >>/Users/jc/w/tmp/Tune-8198-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1776/BB50.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_81986.log 271085 Log file, useful mostly for debugging
Tune-8198-BB50.abc 141 ABC music file with the extracted tune(s)
Tune-8198-BB50.ps 6 PostScript
Tune-8198-BB50.txt 141 Plain-text file with the extracted tune(s)
Tune-8198-get.log 3938 Log file, useful mostly for debugging
Tune-81981-10061_What_Fairy_Like_Music-001.svg 29878 Scalable Vector Graphics format
Tune-81981-10061_What_Fairy_Like_Music.abc 1181 ABC music file with the extracted tune(s)
Tune-81981-10061_What_Fairy_Like_Music.txt 1181 Plain-text file with the extracted tune(s)
Tune-81981-get.log 8403 Log file, useful mostly for debugging
These files should be available for 24 hours.