pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-50520-Tripping_Up_the_Stairs.ps) >>/Users/jc/w/tmp/Tune-50520-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/gradcenter.marlboro.edu/abc/sessionTunes/Tripping_Up_the_Stairs.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
Form_50520.log 789 Log file, useful mostly for debugging
Tune-50520-Tripping_Up_the_Stairs.abc 190 ABC music file with the extracted tune(s)
Tune-50520-Tripping_Up_the_Stairs.ps 34448 PostScript
Tune-50520-Tripping_Up_the_Stairs.txt 190 Plain-text file with the extracted tune(s)
Tune-50520-get.log 4790 Log file, useful mostly for debugging
These files should be available for 24 hours.