Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/session/Oivan_Ilo/Contra_Jig_02.abc/jig"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-75174-jig.ps) >>/Users/jc/w/tmp/Tune-75174-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/session/Oivan_Ilo/Contra_Jig_02.abc/jig

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-75174-get.log 4020 Log file, useful mostly for debugging
Tune-75174-jig.abc 162 ABC music file with the extracted tune(s)
Tune-75174-jig.ps 6 PostScript
Tune-75174-jig.txt 162 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.