pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5626-MarketLass.ps) >>/Users/jc/w/tmp/Tune-5626-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Contra/MarketLass.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_56263.log 284331 Log file, useful mostly for debugging
Coll_56264.log 240774 Log file, useful mostly for debugging
Tune-5626-MarketLass.abc 2167 ABC music file with the extracted tune(s)
Tune-5626-MarketLass.ps 53094 PostScript
Tune-5626-MarketLass.txt 2167 Plain-text file with the extracted tune(s)
Tune-5626-get.log 9959 Log file, useful mostly for debugging
Tune-56260-get.log 1392 Log file, useful mostly for debugging
Tune-56268-get.log 10522 Log file, useful mostly for debugging
These files should be available for 24 hours.