That is so wonderful to hear. Music in schools not only strengthens the maturity of the students involved, it solidifies their reading skills (they are in fact, learning another language) and math skills. It teaches discipline, grace and proper use of emotion. I am so happy your son has taken music back up. It is a life long commitment in our family from both parents and our son sings with us and is now learning music. He has picked up things that I could not have possibly taught him at this age already, like vibrato in his voice.
I cannot tell you how much I look forward to watching my son grow as a musician.