pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-16129-Grassy_Turf-A-24-3.ps) >>/Users/jc/w/tmp/Tune-16129-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ONeills/march/Grassy_Turf-A-24-3.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-16129-Grassy_Turf-A-24-3.abc 713 ABC music file with the extracted tune(s)
Tune-16129-Grassy_Turf-A-24-3.ps 38240 PostScript
Tune-16129-Grassy_Turf-A-24-3.txt 713 Plain-text file with the extracted tune(s)
Tune-16129-get.log 4677 Log file, useful mostly for debugging
These files should be available for 24 hours.