pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7474-ECPMH.ps) >>/Users/jc/w/tmp/Tune-7474-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DanielWright/ECPMH.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Find_74741.log 1519 Log file, useful mostly for debugging
Form_74745.log 827 Log file, useful mostly for debugging
Tune-7474-ECPMH.abc 27262 ABC music file with the extracted tune(s)
Tune-7474-ECPMH.ps 311960 PostScript
Tune-7474-ECPMH.txt 27262 Plain-text file with the extracted tune(s)
Tune-7474-get.log 48501 Log file, useful mostly for debugging
These files should be available for 24 hours.