Although we all know that it is, let's for a moment pretend that it's not 'Wouldn't it Be Nice', just to make it interesting. Here are a couple that are fantastic:
https://www.youtube.com/watch?v=EAXYMOgHQI4
Yes, I seem to remember Steve Miller often put the best track right at the beginning of the album, rather like this splendid example from 1970.Steve Miller has a few.
Song for our ancestors, space intro and threshold too
Rock and Roll star - Oasis
To have this as the opening track on your first album is unreal.
This. Definitely.