Kevin and his Trombone

Today I heard some brass music while working in the lab. I became curious and looked around where it came from.

In the restroom next to the lab I found the source of the music.

Kevin is 27 years old and a student of Mathematics. He plays trombone for over 7 years but took a break for several years. Now he is practicing on a daily basis again. Because he attended a math conference at the university today, the only chance to practice was in the break of the conference.