It's curious that I get this same question from alot of adult students of guitar who feel odd practicing music as if they were to perform it when they have no such intention. My idea is that it is not just the overt act of performance for others (strangers or otherwise) or ourselves which should be our reason for playing, but the exercising of our brain in an artistic act for self-betterment and the continuation of an enduring human skill and art. There's no reasonable difference to me between hearing music in my mind and playing/singing it out loud.

Consequently, it makes sense to me that to focus our concentration, energy, attention, and intent, on a pretend audience makes us play to a higher level. Many a student, however competent a player, can't play a song from beginning to end because they've never tried to simulate the performer/audience relationship. Their songs often lack form, dynamics, and cohesion as a result.

When I first became known as a guitar player in my parish church, I had this same problem. Suddenly I had to play something completely, for the enjoyment of others and to lead worship. It was terrifying to discover that I HAD to play better all the time, even in private, in order to play well in public. The first thing (and casualty) was my rhythm and timing, then my sloppy fingering. It was humbling to discover I wasn't near as good as I though I was.

So, even if you don't intend to play publicly, practicing as if you do will improve your playing, and give you the self-satisfaction and pride of accomplishment.

That's why bother.

Peace and Happy Easter. Mooh.