pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6752-4252_McLeans_Pipes.ps) >>/Users/jc/w/tmp/Tune-6752-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr/MM4/4252_McLeans_Pipes.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
Coll_67527.log 264789 Log file, useful mostly for debugging
Coll_67528.log 340976 Log file, useful mostly for debugging
Form_67527.log 827 Log file, useful mostly for debugging
Tune-6752-4252_McLeans_Pipes.abc 306 ABC music file with the extracted tune(s)
Tune-6752-4252_McLeans_Pipes.ps 34090 PostScript
Tune-6752-4252_McLeans_Pipes.txt 306 Plain-text file with the extracted tune(s)
Tune-6752-get.log 4549 Log file, useful mostly for debugging
Tune-67520-get.log 4382 Log file, useful mostly for debugging
Tune-67522-get.log 4093 Log file, useful mostly for debugging
Tune-67524-get.log 3459 Log file, useful mostly for debugging
Tune-67525-get.log 4470 Log file, useful mostly for debugging
Tune-67526-get.log 1564 Log file, useful mostly for debugging
These files should be available for 24 hours.