I found out the other day just how "noisy" my mind is. I tried to do an experiment - the aim was to concentrate on a particular sound only, and blank out everything else. It was tough. The random thoughts, the complaints, the worries, the song tunes, the comments for the song tunes all just kept popping up, refusing to shut up.
I guess it needs practice. What's the final aim of this exercise? They say the heart speaks much clearer when all the competing sounds and voices are removed from it.