pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-95369-hbc.ps) >>/Users/jc/w/tmp/Tune-95369-get.log 2>&1" returned status 256
http://www.simonplantinga.nl/wordpress/wp-content/uploads/2011/03/hbc.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
Tune-95369-get.log 181981 Log file, useful mostly for debugging
Tune-95369-hbc.abc 299 ABC music file with the extracted tune(s)
Tune-95369-hbc.ps 33147 PostScript
Tune-95369-hbc.txt 299 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.