On the Creators Update, you can now click the music note icon on the top - right corner, and the assistant will identify and tell you what song is playing. (windowscentral.com)
When you engage in a note, you can use the software driven keyboard to input your text and a little note icon appears on the right - hand side. (goodereader.com)
You can also takes notes and save them, after which a little note icon appears on the right margin. (goodereader.com)