pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-49742-1231.ps) >>/Users/jc/w/tmp/Tune-49742-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/GoldenBookOfFavoriteSongs/1231=the_Spanish_Cavalier-v2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-49742-1231.abc 3356 ABC music file with the extracted tune(s)
Tune-49742-1231.ps 54071 PostScript
Tune-49742-1231.txt 3356 Plain-text file with the extracted tune(s)
Tune-49742-get.log 8161 Log file, useful mostly for debugging
These files should be available for 24 hours.