pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-79746-Juliette_1.ps) >>/Users/jc/w/tmp/Tune-79746-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mazurka/Juliette_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
Tune-79746-Juliette_1.abc 474 ABC music file with the extracted tune(s)
Tune-79746-Juliette_1.ps 34887 PostScript
Tune-79746-Juliette_1.txt 474 Plain-text file with the extracted tune(s)
Tune-79746-get.log 4399 Log file, useful mostly for debugging
These files should be available for 24 hours.