A limit in music is like a rule that says how high or low a sound can go. It's kind of like a fence around a playground. Just like how you can't go outside the fence when you're playing, the sound can't go outside of the limit.
Limits can apply to different things in music. For example, when you play an instrument like a guitar or piano, there are only a certain number of notes you can play in a certain range. This is the limit.
Limits also apply to how loud or soft you can play. If you play too loud, it might hurt people's ears, but if you play too soft, people might not be able to hear you. So there is a limit to how loud or soft you can play.
Limits can also apply to how long or short a note is. In some music, you might want to hold a note for a long time, but if you hold it for too long, it might not sound good. So there is a limit to how long you can hold a note.
In summary, limits in music are like rules that tell you how high or low, loud or soft, long or short you can play certain sounds. They are important in making music sound good and not hurting people's ears.