pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-56298-Come_Along_and_Keep_Your_Promise.ps) >>/Users/jc/w/tmp/Tune-56298-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Athole/T/Come_Along_and_Keep_Your_Promise.abc

Error exit status 256; here are some files to check:

[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-56298-Come_Along_and_Keep_Your_Promise.abc 367 ABC music file with the extracted tune(s)
Tune-56298-Come_Along_and_Keep_Your_Promise.ps 38385 PostScript
Tune-56298-Come_Along_and_Keep_Your_Promise.txt 367 Plain-text file with the extracted tune(s)
Tune-56298-get.log 9418 Log file, useful mostly for debugging
These files should be available for 24 hours.