Login Music

So I was listening to the login music from the past expansions and it seems to me that Blizz uses it as a overture to all the music to the current and the last expansion. Anybody else notice this or am I just nerd raging for no point

In interviews in the past, Russell Brower has discussed how he likes to keep the original idea of the login music (the theming and key elements) and build on it with each new expansion. There's an expectation of hearing a certain style of music that says to people that they're logging in to World of Warcraft. It evokes emotions in many people and so he's said he doesn't want to take that away but instead, enhance and add to it with each of the expansions. If you sit and listen to the whole thing, you'll find that you've ended up on a journey of sorts through World of Warcraft history. It tells you about where you've been and where you are now or are going to depending on where you are in your gameplay.