Clical music suggestions?

Hi, my dad is a big lover of clical music and asked me to make him a CD. I have Vivaldi's four seasons, beethoven's ode to joy and fur elise and Mozart's lacrimosa. But I need some more, unfortunately I don't know as much as I would want to and I know that my dad wants some of the most famous, "catchy" clical melodies. Could you please help? Thank you :)