pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-10678-3123-Peggy_Bawn.ps) >>/Users/jc/w/tmp/Tune-10678-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/3123-Peggy_Bawn.abc1.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_10678.log 1298740 Log file, useful mostly for debugging
Form_10678.log 945 Log file, useful mostly for debugging
Tune-10678-3123-Peggy_Bawn.abc 989 ABC music file with the extracted tune(s)
Tune-10678-3123-Peggy_Bawn.ps 39427 PostScript
Tune-10678-3123-Peggy_Bawn.txt 989 Plain-text file with the extracted tune(s)
Tune-10678-get.log 8520 Log file, useful mostly for debugging
These files should be available for 24 hours.