Found music
The video below consists of music made by objects you might "find" around a home. What kind of music could you make with "found instruments" at your house?
instrumental cover
In this video, the melody of One Direction's song is played on the piano, rather than having someone sing it. Therefore, there is still melody along with the accompaniment, but the melody is instrumental. (there is a little singing at the end) A melody can be sung, or it can be played on an instrument that can go up and down.