There will never be a shortage of totems, symbols, or special moments between a parent and a well-loved child. As an involved parent, you are the principal figure in your child's life - or at least tied for it.
So you don't need to force the issue of your special place. In fact, in doing so, you risk looking past the meaningful moments and mementos that your lives together will produce organically - and, in this case, you also risk interfering with the crucial connections between these other family members and your daughter. Hold those reins too firmly and, in time, your daughter will chafe as well.
This might seem like a big answer to a small question, but I believe the most important gift you can give a child is openness to whatever gifts your child brings to you. A small matter like a "special" song is a chance to practice the subtle art of letting your stories write themselves.
E-mail Carolyn Hax at firstname.lastname@example.org or follow her on Facebook at www.facebook.com/carolyn.hax.