pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4963-Just_a_Tune.ps) >>/Users/jc/w/tmp/Tune-4963-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/OriginallyMine/Just_a_Tune.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_49638.log 458411 Log file, useful mostly for debugging
Coll_49639.log 918218 Log file, useful mostly for debugging
Form_49632.log 2914 Log file, useful mostly for debugging
Form_49633.log 1028 Log file, useful mostly for debugging
Tune-4963-Just_a_Tune.abc 1063 ABC music file with the extracted tune(s)
Tune-4963-Just_a_Tune.ps 37227 PostScript
Tune-4963-Just_a_Tune.txt 1063 Plain-text file with the extracted tune(s)
Tune-4963-get.log 4435 Log file, useful mostly for debugging
Tune-49630-get.log 1400 Log file, useful mostly for debugging
Tune-49631-get.log 1394 Log file, useful mostly for debugging
Tune-49634-get.log 1400 Log file, useful mostly for debugging
Tune-49635-get.log 1394 Log file, useful mostly for debugging
Tune-49638-get.log 7160 Log file, useful mostly for debugging
These files should be available for 24 hours.