pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-74011-18_Dowdy.ps) >>/Users/jc/w/tmp/Tune-74011-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1813/Button_Whitaker/18_Dowdy.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_74011.log 277305 Log file, useful mostly for debugging
Tune-74011-18_Dowdy.abc 1240 ABC music file with the extracted tune(s)
Tune-74011-18_Dowdy.ps 37861 PostScript
Tune-74011-18_Dowdy.txt 1240 Plain-text file with the extracted tune(s)
Tune-74011-get.log 4478 Log file, useful mostly for debugging
These files should be available for 24 hours.