pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-65831-104_la_Genoisse.ps) >>/Users/jc/w/tmp/Tune-65831-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/SCAJMR/104_la_Genoisse.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-65831-104_la_Genoisse.abc 624 ABC music file with the extracted tune(s)
Tune-65831-104_la_Genoisse.ps 35181 PostScript
Tune-65831-104_la_Genoisse.txt 624 Plain-text file with the extracted tune(s)
Tune-65831-get.log 4600 Log file, useful mostly for debugging
These files should be available for 24 hours.