Are you serious? I could write a hub on this topic! My husband is a trumpet player who says he had his midlife crisis at the age of 17 when he realized at the NC School of the Arts that the lack of private instruction as a child had caused him to learn a particular bad habit that could not be relearned, and that he was not going to be the world class talent he aspired to become. I have four children. Two have shown little interest (to date) in learning an instrument, but for the other two ... one is a self taught guitarist who writes his own music and who has worked through more than one rough time in his life with this tool of self expression. It means EVERYTHING to him. My only daughter plays six instruments to date ... the clarinet, flute, guitar, ukulele, piano, and French horn with the last three being her favorites. She has played with the NC Symphony, her daddy, and last week composed her very first composition, a lullaby.
I longed for, but was not blessed with, music lessons as a child. Giving your children the opportunity to express themselves with music (when the young so relate to music ANYWAY) is, in my opinion, as important as teaching them to read and write.
PS After reading your profile, I added you to my Google+ writer's circle!