G is probably my most-used key.

I feel anyone can write and sing a song in any key...it's all a matter of how you set up your melody to fit within your range. However, I use certain keys more often simply due to the lazy habit of strumming open chords...a song falls out and there it is...another one in G.

Some keys feel different than others. It's a real feeling, too, because the pitches of notes are simply faster or slower vibrations. As a result, keys take on their own personalities that we begin to recognize and use. I remember Bob Dylan talking about chords...he said something about E being "confident"...I can't remember, but he had a different attribute for each chord. I think my favorite is B flat Major. It just shakes the air like nothing else.

http://www.soundclick.com/MarkKaufman