First, about the Beatles' "All U Need is Love". Written in the time signature of "7". Why is this? Because you leave out the "aight", i.e. in a Liverpool accent you leave out the "hate", all you need is love.
Second, the Imperial March of Star Wars, the theme of Dark Lord Vader. In a minor (sad) key, modulating down to a minor 6, also in a minor key. Can be said to be "hyper-minor", for it is always sad. But embedded within the modulation back to fundamental is a picardy third, a majoring of the minor, it is hidden, because the modulation is so "brickwall". But it is there, and it represents the Dark Lord's sudden and rushing turn back to the good side of the force from years of chaos.