Bar-line shift

Imagine you are drawing a picture with lines and dots on a piece of paper. Now, imagine the lines are called bars and they are the same distance apart from each other. When you add more notes or dots in between the bars, the bars might move a little bit to make room for the new notes.

This is called a bar-line shift. It means that the bars on the paper move a little bit to make room for the new notes you are adding. It's like when you are playing with blocks and you need to move some of them around to fit in a new one.

In music, a bar-line shift might happen if a note or beat is added or removed from a particular measure. This makes the bars shift a little bit to make sure everything is still aligned and organized.

So, think of bar-line shift like rearranging blocks or moving lines on a piece of paper to make sure everything fits properly.