pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6389-Merry_Ploughboy_1.ps) >>/Users/jc/w/tmp/Tune-6389-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/corneymusers/Merry_Ploughboy_1.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
Form_63890.log 858 Log file, useful mostly for debugging
Form_63893.log 873 Log file, useful mostly for debugging
Form_63899.log 851 Log file, useful mostly for debugging
Tune-6389-Merry_Ploughboy_1.abc 423 ABC music file with the extracted tune(s)
Tune-6389-Merry_Ploughboy_1.ps 38341 PostScript
Tune-6389-Merry_Ploughboy_1.txt 423 Plain-text file with the extracted tune(s)
Tune-6389-get.log 6473 Log file, useful mostly for debugging
Tune-63893-get.log 22819 Log file, useful mostly for debugging
Tune-63898-get.log 5102 Log file, useful mostly for debugging
These files should be available for 24 hours.