pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-47918-dream.ps) >>/Users/jc/w/tmp/Tune-47918-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/jazz/dream.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-47918-dream.abc 1220 ABC music file with the extracted tune(s)
Tune-47918-dream.ps 41340 PostScript
Tune-47918-dream.txt 1220 Plain-text file with the extracted tune(s)
Tune-47918-get.log 8178 Log file, useful mostly for debugging
These files should be available for 24 hours.