Messa di voce is a musical technique that sung or played at a quiet volume, gradually and smoothly made louder until it reaches a high volume, then similarly made quiet again. (wikipedia)
When I was so active in singing activity, I liked this word "messa di voce" a lot. One day, I was observing the drizzle outside, but suddenly it was a heavy rain, in a minute, drizzling again. So, I said to my friends, "Hey, this rain plays messa di voce". They were all laughing. "Hahha...well, well, you can say