pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-20812-Walker_Street_Hornpipe_1.ps) >>/Users/jc/w/tmp/Tune-20812-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/hornpipe/Walker_Street_Hornpipe_1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_20812.log 412185 Log file, useful mostly for debugging
Tune-20812-Walker_Street_Hornpipe_1.abc 443 ABC music file with the extracted tune(s)
Tune-20812-Walker_Street_Hornpipe_1.ps 34996 PostScript
Tune-20812-Walker_Street_Hornpipe_1.txt 443 Plain-text file with the extracted tune(s)
Tune-20812-get.log 4790 Log file, useful mostly for debugging
These files should be available for 24 hours.