Disklavier

I use an app called Sweet Midi Player from Roni music.  It works perfectly and they have fantastic support.From an Ipod/Ipad you can connect to your piano with a device like Irig Midi, which I use.  You can then playfrom Sweet Midi Player to the piano.  If you want to go wireless, with a MAC,  you can use the Audio Midi Setup with a USB midi converter.I don't know how to do it with Windows.  I will say though that the direct wired through the Irig Midi works much better.You can then play all the Midi files to your piano.