pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-33815-FCCD2.ps) >>/Users/jc/w/tmp/Tune-33815-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1800/Thompson/FCCD/FCCD2.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-33815-FCCD2.abc 15538 ABC music file with the extracted tune(s)
Tune-33815-FCCD2.ps 116744 PostScript
Tune-33815-FCCD2.txt 15538 Plain-text file with the extracted tune(s)
Tune-33815-get.log 21266 Log file, useful mostly for debugging
These files should be available for 24 hours.