Time to say goodbye is a lovely one. Have whatever you feel suits you, if you want to raise a smile with your song choices, go for it.
I do the music and tech at my church's funerals. There have been a huge variety, from highway to hell, always look on the bright side of life etc to more sombre choices.
What I would suggest though, is that, with your funeral folder of wishes, you write down a sort of, bullet point of eulogy type list. Where you were born and lived as a child etc, who with and when, some key memories from your childhood (perhaps memories with people who will be present at the funeral) and then your "favourite bits" from your life's catalogue as it were.
Obviously things like the birth of children, much loved relatives etc. But what your favourite things were, what you loved to do, your favourite restaurant etc, your favourite place to holiday. Some tales and anecdotes from your perspective.
Quite often, when someone dies, the living are so mired in grief that they forget the good bits.
Having the facts of your life and some prompts from you can help to spark the memories of others and the "oh do you remember when she.." from those planning your funeral and make it easier to formulate.