pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9930-Kerr_MM4-V1.ps) >>/Users/jc/w/tmp/Tune-9930-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr/MM4/Kerr_MM4-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-9930-Kerr_MM4-V1.abc 534 ABC music file with the extracted tune(s)
Tune-9930-Kerr_MM4-V1.ps 37069 PostScript
Tune-9930-Kerr_MM4-V1.txt 534 Plain-text file with the extracted tune(s)
Tune-9930-get.log 4334 Log file, useful mostly for debugging
Tune-99300-Kerr_MM3-V2.abc 485 ABC music file with the extracted tune(s)
Tune-99300-Kerr_MM3-V2.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-99300-Kerr_MM3-V2.ps 36758 PostScript
Tune-99300-Kerr_MM3-V2.txt 485 Plain-text file with the extracted tune(s)
Tune-99300-get.log 92174 Log file, useful mostly for debugging
Tune-99304-get.log 1406 Log file, useful mostly for debugging
Tune-99305-BM3.abc 154 ABC music file with the extracted tune(s)
Tune-99305-BM3.txt 154 Plain-text file with the extracted tune(s)
Tune-99305-get.log 3004 Log file, useful mostly for debugging
These files should be available for 24 hours.