pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-68665-Kerr_MM3-V2.ps) >>/Users/jc/w/tmp/Tune-68665-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr/MM3/Kerr_MM3-V2.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-68665-Kerr_MM3-V2.abc 287 ABC music file with the extracted tune(s)
Tune-68665-Kerr_MM3-V2.ps 33404 PostScript
Tune-68665-Kerr_MM3-V2.txt 287 Plain-text file with the extracted tune(s)
Tune-68665-get.log 4351 Log file, useful mostly for debugging
These files should be available for 24 hours.