Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/mazurka/Kohlers1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6935-Kohlers1.ps) >>/Users/jc/w/tmp/Tune-6935-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/mazurka/Kohlers1.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-6935-Kohlers1.abc 148 ABC music file with the extracted tune(s)
Tune-6935-Kohlers1.ps 6 PostScript
Tune-6935-Kohlers1.txt 148 Plain-text file with the extracted tune(s)
Tune-6935-get.log 5348 Log file, useful mostly for debugging
Tune-69350-get.log 4099 Log file, useful mostly for debugging
Tune-69352-24CountryDances_1808_Goulding.abc 179 ABC music file with the extracted tune(s)
Tune-69352-24CountryDances_1808_Goulding.txt 179 Plain-text file with the extracted tune(s)
Tune-69352-get.log 8266 Log file, useful mostly for debugging
Tune-69353-get.log 1424 Log file, useful mostly for debugging
Tune-69355-get.log 3471 Log file, useful mostly for debugging
Tune-69357-get.log 1413 Log file, useful mostly for debugging
These files should be available for 24 hours.