Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1804/Nelson.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-38355-Nelson.ps) >>/Users/jc/w/tmp/Tune-38355-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1804/Nelson.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-38355-032_the_Flying_Fish.abc 490 ABC music file with the extracted tune(s)
Tune-38355-032_the_Flying_Fish.pdf 10303 Portable Data Format
Tune-38355-032_the_Flying_Fish.ps 33483 PostScript
Tune-38355-032_the_Flying_Fish.txt 490 Plain-text file with the extracted tune(s)
Tune-38355-Nelson.abc 143 ABC music file with the extracted tune(s)
Tune-38355-Nelson.ps 6 PostScript
Tune-38355-Nelson.txt 143 Plain-text file with the extracted tune(s)
Tune-38355-get.log 9575 Log file, useful mostly for debugging
These files should be available for 24 hours.