Wedding March Felix Mendelssohn (1809 - 1847)

http://en.wikipedia.org/wiki/Felix_Mendelssohn

In 1842, Mendelssohn wrote incidental music for the Shakespeare play, A Midsummer Night's Dream, including the famous Wedding March that is played as the recessional at many weddings.

Felix Mendelssohn wrote his first symphony at the young age of fifteen.