pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-45363-O_Maria.ps) >>/Users/jc/w/tmp/Tune-45363-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/session/waltz/O_Maria.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-45363-O_Maria.abc 2087 ABC music file with the extracted tune(s)
Tune-45363-O_Maria.ps 52498 PostScript
Tune-45363-O_Maria.txt 2087 Plain-text file with the extracted tune(s)
Tune-45363-get.log 4908 Log file, useful mostly for debugging
These files should be available for 24 hours.