[andysandmikesmom]

You could always tell when my dad was drunk...for one thing, he weaved and bobbed all over...for another, you could smell the liquor...for another, he got exceptionally mean when he was drunk....I dont know why that was...most of the time, when he got drunk, he just got plain mean, and we were all scared of him....

But this one time, at church, he did behave...but he certainly was drunk...

Shortly after that time, he cut out most of his drinking, except on rare occasions...

[habs4ever]

Could it be a coincidence that your recital changed his ways? Seems more than likely he had an epiphany while you were playing the piano :-)