pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-15438-21112_Dainty_Davie.ps) >>/Users/jc/w/tmp/Tune-15438-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ERM/21112_Dainty_Davie.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_15438.log 1001 Log file, useful mostly for debugging
Tune-15438-21112_Dainty_Davie.abc 517 ABC music file with the extracted tune(s)
Tune-15438-21112_Dainty_Davie.ps 35092 PostScript
Tune-15438-21112_Dainty_Davie.txt 517 Plain-text file with the extracted tune(s)
Tune-15438-get.log 4540 Log file, useful mostly for debugging
These files should be available for 24 hours.