As a piano newbie and novice, i learned piano by myself. I usually play by ears and memorization. Recently i play some songs and recorded it. i realised certain part of the songs the speed(Tempo) is not ideal. It could be a bit too fast or slow and as a result sounds a little bit messy. How do your play a song in an ideal speed (Tempo) and "Control" the whole songs seems like a hard skills to master. Any thoughts?