Post your favorite and I'll add it here.
Https://www.youtube.com/watch?v=g3ENX3aHlqU Sarah Brightman & Andrea Bocelli - "Time to Say Goodbye " (carlberky)
https://m.youtube.com/watch?v=0XEnvbTtR3s Dolores O'Riordan & Pavarotti - "Ave Maria" (WxFollower)