Open your mouth. Yes! That’s right, it’s so obvious that it’s often overlooked but opening your mouth a little more when you sing makes a huge difference to your overall sound.
So many singers have what I call ‘lazy mouth syndrome’ and it is one of the major causes of mumbling and muffled sound. Think of your body as you would think of an instrument like a saxophone or a trumpet. Both of these instruments open up to a really wide, round exit for the sound to come out of. The same applies to you; your mouth is the opening where your sound comes out, so don’t block it off.
Think you’re opening your mouth enough? You’d be surprised. Go and stand in front of a mirror next time you’re singing one of your favorite songs and have a look at how wide your mouth is. What you feel to be really super and ridiculously wide, actually doesn’t look that bad. Go try it out! It improves your sound immediately.