Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Tunes/Kohlers2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6549-Kohlers2.ps) >>/Users/jc/w/tmp/Tune-6549-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Tunes/Kohlers2.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-6549-Kohlers2.abc 146 ABC music file with the extracted tune(s)
Tune-6549-Kohlers2.ps 6 PostScript
Tune-6549-Kohlers2.txt 146 Plain-text file with the extracted tune(s)
Tune-6549-get.log 11587 Log file, useful mostly for debugging
Tune-65490-24_SurrenderofCopenhagen-001.svg 14822 Scalable Vector Graphics format
Tune-65490-24_SurrenderofCopenhagen.abc 903 ABC music file with the extracted tune(s)
Tune-65490-24_SurrenderofCopenhagen.txt 903 Plain-text file with the extracted tune(s)
Tune-65490-get.log 4502 Log file, useful mostly for debugging
Tune-65492-get.log 3252 Log file, useful mostly for debugging
Tune-65493-get.log 5678 Log file, useful mostly for debugging
Tune-65497-get.log 4451 Log file, useful mostly for debugging
Tune-65498-get.log 6161 Log file, useful mostly for debugging
Tune-65499-24CountryDances_1776_Thompson.abc 166 ABC music file with the extracted tune(s)
Tune-65499-24CountryDances_1776_Thompson.ps 6 PostScript
Tune-65499-24CountryDances_1776_Thompson.txt 166 Plain-text file with the extracted tune(s)
Tune-65499-get.log 4513 Log file, useful mostly for debugging
These files should be available for 24 hours.