As a professional musician, whenever I am asked the question: “What is your main instrument?”, I reply: “My voice!” This can take people aback as sometimes a voice is not seen as an instrument.
However it requires the same practice, the same training, the same amount of time and work, to keep this instrument like you would any other. The upsides being that you always have the instrument with you: the downsides being that you can’t always perform when you have a cold.
I currently sing in three bands, sing solo, and teach singing. My teaching work is based in my home in County Durham, UK; I also teach worldwide via Skype/Facetime. Please do get in contact if you’re interested!