usually a piano sheet or something which tells us the keys of the music..
Yes
Graeme Revell was credited with the Original Motion Picture Musical Score for 'The Crow'. http://en.wikipedia.org/wiki/Graeme_Revell http://www.graemerevell.com/ Product Details. Original Release...
musical codes
Music scores and notes - the notation of music. Music must be notated so that other people can play/sing it.