pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-39972-338_Will_you_marry_Kitty.ps) >>/Users/jc/w/tmp/Tune-39972-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1798/Preston/338_Will_you_marry_Kitty.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-39972-338_Will_you_marry_Kitty.abc 829 ABC music file with the extracted tune(s)
Tune-39972-338_Will_you_marry_Kitty.ps 33890 PostScript
Tune-39972-338_Will_you_marry_Kitty.txt 829 Plain-text file with the extracted tune(s)
Tune-39972-get.log 4874 Log file, useful mostly for debugging
These files should be available for 24 hours.