Four Drifting Seasons is a composition for voices by Merlijn Twaalfhoven in which the rise in temperature between the years 1880 and 2017 is made audible. Choirs of all levels can use this composition to allow their audience an experience of global warming. With the use of an app, pitches are played that can immediately be reproduced by the singers. The composition was developed on behalf of the United Nations and premiered during the Concert for a Sustainable Planet at Carnegie Hall, New York on the 18th of September 2017.
In spite of an abundance of data and scientific evidence, the issue of climate change is rarely experienced on a personal level. By directly converting the measurement data from NASA into pitch by means of an algorithm, an abstract composition is created full of strange harmonies and spectacular dissonances. Yet the result is very musical and emotionally charged. This can have a huge impact and encourages people to think about how they can help combat climate change.