Music Hexagon (part 2)

Here are the other three songs I am placing around my Musical Element Hexagon.  Remember, if you can guess the element that connects them all, you'll be receiving extra credit.

"The Entertainer"

"Hungarian Dance No. 5"

The name of this song escapes me... but if you don't know Antonio Carlos Jobim, then you're welcome.

Remember - if you can tell me a musical element that all 6 of these pieces share, you'll receive extra credit.