pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-20616-AcrobatsHornpipe.ps) >>/Users/jc/w/tmp/Tune-20616-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ryan-cole/Tunes/AcrobatsHornpipe.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_20616.log 402350 Log file, useful mostly for debugging
Tune-20616-AcrobatsHornpipe.abc 639 ABC music file with the extracted tune(s)
Tune-20616-AcrobatsHornpipe.ps 38003 PostScript
Tune-20616-AcrobatsHornpipe.txt 639 Plain-text file with the extracted tune(s)
Tune-20616-get.log 10152 Log file, useful mostly for debugging
These files should be available for 24 hours.