pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-50686-04004_Another_Margarets_Waltz.ps) >>/Users/jc/w/tmp/Tune-50686-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/by/Bob_McQuillen/book04/04004_Another_Margarets_Waltz.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-50686-04004_Another_Margarets_Waltz.abc 588 ABC music file with the extracted tune(s)
Tune-50686-04004_Another_Margarets_Waltz.ps 35336 PostScript
Tune-50686-04004_Another_Margarets_Waltz.txt 588 Plain-text file with the extracted tune(s)
Tune-50686-get.log 4910 Log file, useful mostly for debugging
These files should be available for 24 hours.