pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5690-Kerr_MM3-V1.ps) >>/Users/jc/w/tmp/Tune-5690-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr/MM3/Kerr_MM3-V1.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-5690-Kerr_MM3-V1.abc 317 ABC music file with the extracted tune(s)
Tune-5690-Kerr_MM3-V1.ps 34103 PostScript
Tune-5690-Kerr_MM3-V1.txt 317 Plain-text file with the extracted tune(s)
Tune-5690-get.log 4274 Log file, useful mostly for debugging
Tune-56900-get.log 11233 Log file, useful mostly for debugging
Tune-56901-get.log 2502 Log file, useful mostly for debugging
Tune-56903-get.log 3570 Log file, useful mostly for debugging
Tune-56904-get.log 1396 Log file, useful mostly for debugging
Tune-56905-AGJ03.abc 506 ABC music file with the extracted tune(s)
Tune-56905-AGJ03.txt 506 Plain-text file with the extracted tune(s)
Tune-56905-get.log 3055 Log file, useful mostly for debugging
Tune-56907-get.log 2806 Log file, useful mostly for debugging
These files should be available for 24 hours.