I have a friend who is a Celebrant and he conducts very many simple funerals. His particular dislike is hymns which either no-one knows or is too upset to sing. You can have what you like - secular songs, music, but I think it would be difficult for family and friends to have nothing at all. I completely agree with the speech by someone who didn't know the person at all, having witnessed a local vicar doing just that. A good celebrant will take time to talk to the family and find out about the person, what they wanted, what the family wanted, and compose an appropriate goodbye ceremony. We had him for my parents, he didn't know them, or us then, but took many hours to find out and several people thought he had actually been a close friend beforehand. Helps if you write a few notes yourself too - my dad did that, which I thought was a bit controlling (and typical of him) at the time, but dealing with (and all the associated admin) is hard enough; having an idea of what the person wanted makes it so much less difficult.