Happy Birthday, April Classical Composers!
There were LOTS of popular classical composers born in the windy month of March: Bach, Chopin, Vivaldi, Ravel, Wolf, Mussorgky, Rimsky-Korsakov. There aren't nearly as many April composer babies. Here are some of the names you're likely to know:

Sergei Rachmaninoff: 04/01/1873 - 03/28/1943
Ruggero Leoncavallo: 04/23/1857 - 08/09/1919
Sergei Prokoviev: 04/23/1891 - 05/05/1953
Franz Lehar: 04/30/1870 - 10/24/1948
Giacomo Carissimi: 04/18/1605 - 01/12/1674
If you want to look for the birthdays of other great Classical Music Composers sorted in various ways, use this link: Classical Music Composers.