If several recordings of a person singing the exact same pitch were played back simultaneously, it would typically sound like a single voice, but with a fuller and potentially richer sound. This effect is known as vocal doubling or chorus.
When multiple recordings of the same pitch are layered together, the slight variations in each recording—such as timing, subtle pitch fluctuations, and tonal nuances—create a sense of depth and texture. The combined effect can give the impression of a larger vocal ensemble or a thicker, harmonically richer sound.
The precise outcome depends on several factors, including the number of recordings, their individual characteristics, the quality of the recordings, and how they are mixed together. When done carefully, the result can be a cohesive and blended sound that resembles a single voice with added depth and presence.
It's worth noting that the specific timbre and characteristics of the individual's voice, as well as any intentional variations or inconsistencies in the recordings, can also influence the final perception of the sound.