pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-66041-Amazing_Grace_arr_Dave_Palladino_16.ps) >>/Users/jc/w/tmp/Tune-66041-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/corneymusers/Amazing_Grace_arr_Dave_Palladino_16.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_66041.log 828 Log file, useful mostly for debugging
Tune-66041-Amazing_Grace_arr_Dave_Palladino_16.abc 327 ABC music file with the extracted tune(s)
Tune-66041-Amazing_Grace_arr_Dave_Palladino_16.ps 36956 PostScript
Tune-66041-Amazing_Grace_arr_Dave_Palladino_16.txt 327 Plain-text file with the extracted tune(s)
Tune-66041-get.log 8381 Log file, useful mostly for debugging
These files should be available for 24 hours.