pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-37968-waltzes.ps) >>/Users/jc/w/tmp/Tune-37968-get.log 2>&1" returned status 256
http://abc.sf.net/NMD/nmd/waltzes.txt

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-37968-get.log 4112 Log file, useful mostly for debugging
Tune-37968-waltzes.abc 315 ABC music file with the extracted tune(s)
Tune-37968-waltzes.ps 34170 PostScript
Tune-37968-waltzes.txt 315 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.