Rhythm is one of the most important elements of the musical language, arguably even more so than melody and harmony. Try this: without singing, clap the rhythm of “Happy Birthday.” I bet you could ask someone what you are clapping and they would be able to guess “Happy Birthday.” Now try singing “Happy Birthday” without rhythm. I don’t mean with the wrong rhythm; I mean completely without any duration or strong and weak beats. You can’t do it. That is why rhythm is so essential to the musical language.