That's what I'm finding as well. Nothing that goes beyond describing him as "playing trombone" or "a budding trombonist." I'm paraphrasing there, but it sure seems like he just started taking lessons, probably that fall in school. I think most kids start band in 5-6 grade.
Re: shergal, others discussing DR and Polka Padre being friends--
This seems extremely likely. It even seems like there might be proof of this somewhere--a photo? A newspaper article? They lived in such close proximity, and musicians tend to know other area musicians, especially in smaller towns. Polka Padre could have "played a gig," if you will, on the night of the abduction, right in St. Joseph. Or, could he have planned to go to the Polka Fest and maybe dropped in on DR instead?
But, if Padre was at the Polka Fest, you'd think LE would know that and would have checked him out.