This is an interesting idea I can see how this would help. I've noticed that rather than just trying to be aware of everything around me, it usually helps if I focus my mind on a singular thing for a while beforehand to keep me focused in the present. If I'm just observing what's around me I tend to get distracted by what I see or hear and my mind wanders. So what I try to do is keep my mind focused on a single part of myself, such as my breathing or the sensation of my clothes, or recite some sort of mantra while being aware to keep my mind from just drifting off. I've noticed that doing this really helps with my concentration and if I do it often enough I can prevent my mind from just jumping from thought to thought randomly.

I like to think of ADA as not just outer awareness of your environment, but inner awareness as well. Note what your mind and body are doing and how they respond to certain stimuli during these awareness sessions.

I don't really listen to much music so I doubt I could focus on a single song for very long or recall it completely, but if it works for you to keep you focused then go for it!