You were In a band. David, being your father, of course knew this. You often went to band practice after school and on weekends, and you always told your dad so. He just didn't really know what kind of music you made because he's never really asked.

So, you proposed he should come to band rehearsal. Usually your band rehearsals took a bit of time, so he'd probably only stay for an hour or so. But he seemed really excited.

You'd just arrived, David plopped down on a chair while you got your instrument. He looked quite interested to see what you're doing.