Tonio Costa, the temperamental darling of the opera world, is forever missing performances because of impromptu street concerts and endless parties. But Tonio's carefree ways change when he falls in love with Christa, a beautiful deaf girl. Christa refuses to marry him until she can hear his sublime voice. So, they embark upon a whirlwind concert tour and their love grows stronger, while they realize that as long as they are together, they can face whatever the future holds.