ok, I try to. I'm not perfect. and I definitely try. but mumbling is definitely still an issue sometimes.
BUT. still. As a singer, and a performer in general, speaking clearly is very important. How in the world can you touch an audience if they don't know what you are even saying?
Then there are those words that people subconsciously 'mumble'... Have you ever noticed how people (yourself included) say "Fur" instead of "For" when you are talking quickly? Start listening for it. It'll drive you crazy!
My personal favorite is (my favorite word): obviously. Most people just say "ah-viously". Hello! You're missing the very important "b" sound! So, I always try to say "ah-B-biously" :) It's such a fun word :) It's so sassy.
This leads me to my second point: Taylor Swift
I have no problems with her songs, I actually like a lot of them. But seriously- I can NEVER understand her songs. I constantly have to ask people what the lyrics are, because apparently that's why her songs are so good. But a dear friend showed me the following video. And honestly, this is how I feel when I hear her songs (especially the first time).
"Na, Na, Na, Na, Na, Na, cold hard ground!"
com'mon people. a little enunciation goes a long way.