pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6855-Donnas_Waltz.ps) >>/Users/jc/w/tmp/Tune-6855-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/by/Phil_Cunningham/Donnas_Waltz.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_68558.log 250689 Log file, useful mostly for debugging
Form_68557.log 839 Log file, useful mostly for debugging
Tune-6855-Donnas_Waltz.abc 483 ABC music file with the extracted tune(s)
Tune-6855-Donnas_Waltz.ps 41561 PostScript
Tune-6855-Donnas_Waltz.txt 483 Plain-text file with the extracted tune(s)
Tune-6855-get.log 4332 Log file, useful mostly for debugging
Tune-68551-get.log 4427 Log file, useful mostly for debugging
Tune-68555-get.log 4669 Log file, useful mostly for debugging
Tune-68556-get.log 10162 Log file, useful mostly for debugging
These files should be available for 24 hours.