Men have better developed, sophisticated part of the brain that deals with Mathematics and abstraction :yahoo:. Music is highly mathematical. This affinity of mathematicians to music has been mentioned earlier.
Please read the below to understand the intricate connection between maths and music
http://www.pages.drexel.edu/~jjn27/mathandmusic.pdf
In fact, you will find women who can sing better than men. However, It is difficult to find women who have composed musical treasures like Bach, Beethoven, Haydn and our very own composers like Naushad, Anil Biswas.
Note: Activating my MCP Missile shield