I think a good opening song for Kate and Humphrey would be "You Make Me Smile" a vid was posted on here awhile back but it is all over you tube search for "Alpha and Omega, makes me smile" it will be there, hope this helps!
Hmm I would love to see an Alpha and Omega sequel be turn into a musical since I happen to love musicals (I'm a big music freak at heart when it comes to pop songs, dance songs, and rock songs)
But if you notice during the howling scenes of the film, it almost comes close to a musical...if there was more.