pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7649-proto.ps) >>/Users/jc/w/tmp/Tune-7649-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MSRPB/proto.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_76490.log 287140 Log file, useful mostly for debugging
Coll_76491.log 285735 Log file, useful mostly for debugging
Coll_76496.log 282925 Log file, useful mostly for debugging
Coll_76499.log 287140 Log file, useful mostly for debugging
Tune-7649-get.log 4386 Log file, useful mostly for debugging
Tune-7649-proto.abc 474 ABC music file with the extracted tune(s)
Tune-7649-proto.ps 31007 PostScript
Tune-7649-proto.txt 474 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.