The colour is a protagonist in the perception phenomenon. This article shows a method to paint popular houses, based on an analogy between colours and musical notes. The colour palette is obtained by mixing chalk to a popular pigment (pó xadrez) and then establishing equivalence between these colours and a musical scale. The chromaticism is performed according to various generative criteria, one of which adopts the plant as a piano roll, proposing each unit to be painted in the colour of its corresponding note, showing that creative solutions can be achieved including colour modular coordination principles in the design process.