Lately, I have been learning some songs on piano, very simple ones. I have been doing it by ear so I haven't had the need to use sheet music and read it for those songs.
Since I don't have to read it I can focus on the music more, but this leads to the problem. When I play by ear my body starts to get into the music and I slightly sway. It just suddenly happens and I don't notice. It isn't too much too just a bit but a noticeable bit.
I asked my friend, who has been playing flute for two years, if she has done this before just to see if it happens to people who play other things. She said that she has never heard of anyone doing the sort.
I know that other pianists do it but I have been constantly told that not everything that I see should be mimicked since it isn't always right. So am I hindering my practice by doing this? Will it harm me if I keep on doing it?