pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-28907-20_Clarissa.ps) >>/Users/jc/w/tmp/Tune-28907-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1813/Button_Whitaker/20_Clarissa.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_28907.log 287140 Log file, useful mostly for debugging
Tune-28907-20_Clarissa.abc 1131 ABC music file with the extracted tune(s)
Tune-28907-20_Clarissa.ps 35243 PostScript
Tune-28907-20_Clarissa.txt 1131 Plain-text file with the extracted tune(s)
Tune-28907-get.log 4545 Log file, useful mostly for debugging
These files should be available for 24 hours.