Sibelius

Don't understand why somebody can't do an open source Sibelius- a free music notation program... it should be quite easy i think... just five lines and let ppl enter note values, and maybe a midi playback system... it'll rock! I'm sick of Sibelius' high memory footprint as well as the lack of a portable system. Imagine how much it would rock if sibelius were ported to the mobile platform. Charge it at a reasonable price(maybe 10-20 dollars) and they'll instantly see $$$..haha