I would have the lights dimmed, and have sound effects of rain falling on pavement playing loudly.
I believe the answer is Rubato, when composers slightly slow down or speed up the tempo of the music
Gouache paints come in many colors and are usually mixed with water to achieve the desired working properties and to control the opicity when dry, also like watercolor, gouache dries to a matte finish. it is similar to acrylic or oil paints in that is normally used in an opaque painting style
