pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-39097-006_Firefly.ps) >>/Users/jc/w/tmp/Tune-39097-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JeanWhite/100_Popular_HRJCD/006_Firefly.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-39097-006_Firefly.abc 744 ABC music file with the extracted tune(s)
Tune-39097-006_Firefly.ps 37169 PostScript
Tune-39097-006_Firefly.txt 744 Plain-text file with the extracted tune(s)
Tune-39097-get.log 4569 Log file, useful mostly for debugging
These files should be available for 24 hours.