I show you my menu in my home:
Menu

http://groups.drupal.org/files/menu_0.png

And this is what i need when people click in <<'musical services'>>, isn't a hover or on:click. I mean, when musical-services page loads, it loads the submenu too.
submenu

http://groups.drupal.org/files/submenu.png

How do i do this, any tutorial or something?

Thank you, Jorge.