It was recently pointed out to me that Justin Bieber is only 17 years old. At the age of 17 Bieber has two studio albums which include such best selling hits as "Baby" and "U Smile" (sic), and he is working on a third studio album. This is the first the movement (Allegro con brio) of the 25th symphony, one piece out of the six symphonies Mozart composed at the same age.