Last night in the bath Ella surprised me when I was singing to her because she looked right back at me and tried to sing too! It was amazing - she really concentrated, and it sounded like she sang the same 2 or 3 notes, over and over - she would sing a few notes, pause for a few seconds, then repeat.
Then after I put her to bed I heard on on the monitor and she was continuing to practice...I recorded it to make a little video clip. You have to turn up your speakers to hear it, but she definitely "sings" a few notes (she's singing "Doe a Deer" from the Sound of Music) takes a pause, then sings it again. Totally adorable!!