What is the name of the song that Will Ferrell sang at the end of Step Brothers?!

Question: What is the name of the song that Will Ferrell sang at the end of Step Brothers!?
Answers:

Time to say good bye by Andrea Bocelli and Sara Brightman!.Www@Enter-QA@Com

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My link is the scene, from the movie!.Www@Enter-QA@Com

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