pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-20674-it_happens_quietly.ps) >>/Users/jc/w/tmp/Tune-20674-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/jazz/it_happens_quietly.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-20674-get.log 4599 Log file, useful mostly for debugging
Tune-20674-it_happens_quietly.abc 1073 ABC music file with the extracted tune(s)
Tune-20674-it_happens_quietly.ps 40832 PostScript
Tune-20674-it_happens_quietly.txt 1073 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.