Does anybody know if there is a piano music sheet reader which plays it for you?

Most music editing programs will play back music you've written in them.





Also music purchased from sites like SheetMusicDirect.com use a program called Scorch. This will playback the song you've bought, following the music. With this plugin you can also transpose the music you've purchased, or change the instrument playing it, but I don't think its possible to put music into scorch.





Your best shot if you already own the piece is to find any free music composing software and manually input it.