The same reason why we like listening to ourselves sing in the bathroom. The close walls create millions of tiny echoes, and in general this effect is called reverb. Same reason why some concerts happen in Cathedrals. This effect makes a voice sound fuller, and also helps blend the notes together. In studio recordings, this effect is usually added artificially during production. It’s there all the time, but it’s difficult to spot while all the instruments are playing. If you have a trained ear, you can notice it anytime.
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