MagiStream

probably landslide by the smashing pumpkins. the dixie chicks one is just up to par due to growing up listening to that version.

Phsyco by MUSE! I saw them live a few days ago and it was wild!

Carousel by Linkin Park. It's difficult to list only one, but I know it's my favorite.
(I don't know if you can list two songs, but I also really love Silhouette by Owl City)

Why'd you have to make me pick!!?!?!?!?!?!? xD
But if I absolutely HAVE to, I'd say it's:
Wanted - Hunter Hayes

Almost Lover by a Fine Frenzy

... there are tears in my eyes every time I hear this song... (Czech version)

https://www.youtube.com/watch?v=2NFjPuEVX-U

The English original:

https://www.youtube.com/watch?v=l3LFML_pxlY

Dissolve by Absofacto! Reminds me of an old friend

I can't pick a favorite song, that's like asking me to pick a favorite child! (I don't have kids but you know what I mean!) Music is such a huge, important part of my life and my tastes in music varies wildly depending on my mood, so favorite songs can change by the day, even hourly. But I will say that "Genius" by Sia/Diplo/Labyrinth has been getting played in repeat a lot lately, as has "Wretches and Kings" by Linkin Park (just seems relevant for our current political climate in the US), "The Nights" by Avicii (rip) and "This Is America" by Childish Gambino.

Pilgrim by Enya.

It is a slow calming song.

"One way leads to diamonds. One way leads to gold. Another leads you only to everything you're told. In your heart you wonder. Which of these is true. The road that leads to no where. The road that leads to you."

I think at this point, my favourite song is "Fear Not this Night" from the Guild Wars 2 OST. Just something about the sounds of it that get me.

My second - though has no 'words', so probably classifies more as 'music' than a 'song' would be the Skyrim Theme. That one has been in my playlist for several years now without break.