pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-78336-88B_Blackbird_G.ps) >>/Users/jc/w/tmp/Tune-78336-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/HillCountryTunes/88B_Blackbird_G.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-78336-88B_Blackbird_G.abc 588 ABC music file with the extracted tune(s)
Tune-78336-88B_Blackbird_G.ps 33518 PostScript
Tune-78336-88B_Blackbird_G.txt 588 Plain-text file with the extracted tune(s)
Tune-78336-get.log 4624 Log file, useful mostly for debugging
These files should be available for 24 hours.