What would I change in some songs?

[Villavic]

What change would you make in a Fleetwood Mac song?
Just little (or not so little) adjustments that you may wish in some songs. I mean,

For example, I would like to extend Sara enough seconds so that the phrases "All I ever wanted.. was to know..." would be heard louder and complete.

And though Crystal has never been a favorite of mine, I'm uneasy at the thought of confirming that, if it was sung by Christine, I'd like it more.