If you mean with no music, it's a cappella. If it's alone with music, it's solo.
There are a few different types of unaccompanied songs that are for voices only. A cappella for example is the most popular type of unaccompanied songs for voice.
bass or basso is the lower male voice.
madrigal also, a capella
baritone
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Casting Crowns sings the song Voice Of Truth. Lead-singer, Mark Hall wrote the song, Voice Of Truth and Voice Of Truth can be found on their Casting Crowns (self-titled) album.
we actually have a voice box in our body that gives us our voice to sing
Mariah Carey
she sings she has a great voice
No,she sings naturally.
arthur bostrom
In choral music, the soprano voice typically sings the melody and is often considered the highest voice part, while the alto voice provides harmony and support. In a discant, which is a type of counterpoint where a melody is elaborated with additional notes, it is usually the soprano that sings the discant line above the alto. Thus, the soprano voice is more commonly associated with singing discants.