When the UK was hit by a heatwave and unprecedented dry spell last summer, people were urged to shower for four minutes or less to help alleviate the situation. To support this, charity WaterAid and Spotify got together to help Brits conserve water using a specially designed music playlist to time showers by featuring songs that each run for precisely four minutes. Some of them were water-themed, such as Adele’s “Water Under the Bridge,” etc. A good example of music acting as a “nudge.”