pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-62226-1774_Thompson.ps) >>/Users/jc/w/tmp/Tune-62226-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1774_Thompson.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-62226-1774_Thompson.abc 16966 ABC music file with the extracted tune(s)
Tune-62226-1774_Thompson.ps 131208 PostScript
Tune-62226-1774_Thompson.txt 16966 Plain-text file with the extracted tune(s)
Tune-62226-get.log 17028 Log file, useful mostly for debugging
These files should be available for 24 hours.