This project focuses on sound in architecture and the urban environment. The location of this project is Friche Josaphat, a green and biodiverse area located in Brussels. Being a void over the last years, this place changed into a biodiverse landscape. The main question of this research is: what is the sound of the Friche? By listening and analyzing these sounds through making music, information about the context of the building site is gained. A sonic plan is made which serves as a base for the landscape design. A Sonic & sculpture park has been designed where the sounds of the Friche will be emphasized through adding more diversity in the landscape of the Friche and adding sculptures, sound art and places to listen to the sounds. The visitors center that is designed is one of the two entrances to this park. This building creates a gradient in sound from the urban environment of brussels to the park and introduces the visitor to sounds. The building also shows a gradient of materiality from urban to green. The visitors center is an educational place for people from the neighbourhood and contains a café and exhibition about sounds and green. After designing the building a new sonic plan is made, but then on building scale. Music is composed to emphasize the different atmospheres in the building.