Meditation and Hearing

I practised meditation for two reasons that I can remember. The first was to relax after some sort of strong emotional distress. The second was to to focus on my hearing ability. I would sit in quiet-ish areas and try to focus on one noise that was distinctly more quiet than other noises, the hum of an electronic device is a good example. I would work on concentrating on that until it was easy to pick that thing out from others. Then I started to try focusing on more than one thing. I would find a recording of a simple drum beat and then I would concentrate on both the hum and the beat. After that, I started to try to count the drum beats and concentrate on the hum again. I continued with this sort of thing, until I was able to focus on three things with proficiency. After that, I tried to concentrate on things that were more distant from me. This worked fairly well, and at one point in time, I could sit in crowded rooms and listen in to one conversation over others.