pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-77751-Mazurka_1.ps) >>/Users/jc/w/tmp/Tune-77751-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mazurka/Mazurka_1.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_77751.log 607999 Log file, useful mostly for debugging
Tune-77751-Mazurka_1.abc 456 ABC music file with the extracted tune(s)
Tune-77751-Mazurka_1.ps 35796 PostScript
Tune-77751-Mazurka_1.txt 456 Plain-text file with the extracted tune(s)
Tune-77751-get.log 4370 Log file, useful mostly for debugging
These files should be available for 24 hours.