pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1974-milwsun1.ps) >>/Users/jc/w/tmp/Tune-1974-get.log 2>&1" returned status 256
http://www.abc2win.com/milwsun1.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
Coll_19744.log 137362 Log file, useful mostly for debugging
Form_19741.log 885 Log file, useful mostly for debugging
Tune-1974-get.log 4110 Log file, useful mostly for debugging
Tune-1974-milwsun1.abc 184 ABC music file with the extracted tune(s)
Tune-1974-milwsun1.ps 34360 PostScript
Tune-1974-milwsun1.txt 184 Plain-text file with the extracted tune(s)
Tune-19740-get.log 1678 Log file, useful mostly for debugging
Tune-19741-get.log 7400 Log file, useful mostly for debugging
Tune-19744-get.log 3702 Log file, useful mostly for debugging
Tune-19747-get.log 3188 Log file, useful mostly for debugging
Tune-19748-get.log 5258 Log file, useful mostly for debugging
These files should be available for 24 hours.