Music is an effective form of expression. For children, creating music is not only a joy, but the process also helps with their cognitive development. However, mastering and performing music well with instruments require a vast amount of knowledge and years of repetitious training. TempoString is a novel tool which allows children to create their own music by simply pointing on a canvas with their fingers and editing music using a rope. This way, we transit music creation into painting, a metaphor which is much easier to manipulate. This tool addresses its ease of use and natural interaction, which may help cultivate children’s interest in music. The key feature of our tool is editing music with a rope. With force feedback, music is endowed with tangibility and thus users can feel it with their hands. Such feedback in turn makes it better for children to edit music and thus contributes to the development of cognition.