pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-79294-perhaps.ps) >>/Users/jc/w/tmp/Tune-79294-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/jazz/perhaps.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-79294-get.log 7137 Log file, useful mostly for debugging
Tune-79294-perhaps.abc 371 ABC music file with the extracted tune(s)
Tune-79294-perhaps.ps 34030 PostScript
Tune-79294-perhaps.txt 371 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.