pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-68527-czmaz.ps) >>/Users/jc/w/tmp/Tune-68527-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/8ung.at/diatonica/abc/czmaz.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-68527-czmaz.abc 311 ABC music file with the extracted tune(s)
Tune-68527-czmaz.ps 33473 PostScript
Tune-68527-czmaz.txt 311 Plain-text file with the extracted tune(s)
Tune-68527-get.log 16129 Log file, useful mostly for debugging
These files should be available for 24 hours.