pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-21439-RJ_Squares_RJ.ps) >>/Users/jc/w/tmp/Tune-21439-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/RJ/sets/RJ_Squares_RJ.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-21439-RJ_Squares_RJ.abc 811 ABC music file with the extracted tune(s)
Tune-21439-RJ_Squares_RJ.ps 35163 PostScript
Tune-21439-RJ_Squares_RJ.txt 811 Plain-text file with the extracted tune(s)
Tune-21439-get.log 14533 Log file, useful mostly for debugging
These files should be available for 24 hours.