pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-21136-BurnsWaltzes.ps) >>/Users/jc/w/tmp/Tune-21136-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/BurnsWaltzes.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_21136.log 635584 Log file, useful mostly for debugging
Tune-21136-BurnsWaltzes.abc 2625 ABC music file with the extracted tune(s)
Tune-21136-BurnsWaltzes.ps 46031 PostScript
Tune-21136-BurnsWaltzes.txt 2625 Plain-text file with the extracted tune(s)
Tune-21136-get.log 5002 Log file, useful mostly for debugging
These files should be available for 24 hours.