pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-1556-ERM-V2.abc -F fmt/pdf_55.fmt +s 0.55 +maxs 2000 )>/Users/jc/w/tmp/Tune-1556-ERM-V2.ps 2>>/Users/jc/w/tmp/Tune-1556-get.log" returned status 35584.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1556-ERM-V2.ps) >>/Users/jc/w/tmp/Tune-1556-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ERM/ERM-V2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_15561.log 458410 Log file, useful mostly for debugging
Coll_15562.log 890217 Log file, useful mostly for debugging
Coll_15568.log 905618 Log file, useful mostly for debugging
Form_15562.log 1971 Log file, useful mostly for debugging
Form_15566.log 1011 Log file, useful mostly for debugging
Form_15569.log 949 Log file, useful mostly for debugging
Tune-1556-ERM-V2.abc 258361 ABC music file with the extracted tune(s)
Tune-1556-ERM-V2.ps 1574723 PostScript
Tune-1556-ERM-V2.txt 258361 Plain-text file with the extracted tune(s)
Tune-1556-get.log 232201 Log file, useful mostly for debugging
Tune-15565-get.log 1467 Log file, useful mostly for debugging
These files should be available for 24 hours.