Why did Soundkeeper banish sounds?

Population growth created new sounds.... some not so nice sounds, and Soundkeeper found few sounds worth collecting. The wonderful sounds had become meaningless less noise. Even Dr. Dischord couldn't solve the problem. Thus, the Soundkeeper, became angry and banished sound altogether.

"People laughed less and grumbled more, sang less and shouted more, and the sounds they made grew louder and uglier. It became difficult to hear even the birds or the breeze, and soon everyone stopped listening for them."

"The Soundkeeper grew worried and disconsolate. Each day there were fewer sounds to be collected, and most of those were hardly worth keeping.

" 'FROM THIS DAY FORWARD THE VALLEY OF SOUND SHALL BE SILENT. SINCE SOUND IS NO LONGER APPRECIATED, I HEREBY ABOLISH IT. PLEASE RETURN ALL UNUSED AMOUNTS TO THE FORTRESS IMMEDIATELY.'