pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-14972-Little_Swallow-G-28-5.ps) >>/Users/jc/w/tmp/Tune-14972-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ONeills/air/Little_Swallow-G-28-5.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-14972-Little_Swallow-G-28-5.abc 908 ABC music file with the extracted tune(s)
Tune-14972-Little_Swallow-G-28-5.ps 43918 PostScript
Tune-14972-Little_Swallow-G-28-5.txt 908 Plain-text file with the extracted tune(s)
Tune-14972-get.log 7852 Log file, useful mostly for debugging
These files should be available for 24 hours.