pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-37924-136.ps) >>/Users/jc/w/tmp/Tune-37924-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EverydaySongBook/136=the_Oak-Tree-V2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-37924-136.abc 1671 ABC music file with the extracted tune(s)
Tune-37924-136.ps 37613 PostScript
Tune-37924-136.txt 1671 Plain-text file with the extracted tune(s)
Tune-37924-get.log 4660 Log file, useful mostly for debugging
These files should be available for 24 hours.