pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5551-MNSTRLBY.ps) >>/Users/jc/w/tmp/Tune-5551-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/corneymusers/orig/MNSTRLBY.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_55510.log 140387 Log file, useful mostly for debugging
Tune-5551-MNSTRLBY.abc 0 ABC music file with the extracted tune(s)
Tune-5551-MNSTRLBY.ps 0 PostScript
Tune-5551-MNSTRLBY.txt 0 Plain-text file with the extracted tune(s)
Tune-5551-get.log 4071 Log file, useful mostly for debugging
Tune-55512-get.log 184341 Log file, useful mostly for debugging
These files should be available for 24 hours.