[The Bard Rocks]

Voices are not in particular keys. That said often certain keys work better with your voice. that's not because of the key but because of the range of notes within the key. Think of it this way: you can sing just so high and just so low, and probably your comfort zone is an even shorter range of notes. Here's what I do to determine the key I will use. First, I know how high and how low I can sing, then I look at the high and the low notes in the song, and select a key that keeps these centered around my sweetest spot.

I don't use capos often but there are times when I prefer the fingering in a certain key but want to sing in another. And, more often, someone else will start a song, say in G, but I've always played it in D. So one goes the capo so I get the fingering I prefer but can stay in tune with the singer.