At music students made their own music pieces. They were doing them collaboratively so we kept the same groups at art. We talked about John Cage and his work in music and visual art.
Each student in a group got a piece of transparent tracing paper and worked on it in various media while listening to music they created.
At the end we joined the work of every child in a group by placing pieces on top of each other and observed the different visual expressions on light tables and windows.