Song: Silent Wind
Artist: Eri Sugai
Anime: Argento Soma

This is the full version of the opening to one of my favorite mech-anime, Argento Soma.

The main reason I put this video up was to promote the series a little bit since it's not widely known. Which is a shame since it's a great anime with a compelling story, cool art-style and solid action-sequences.
Imagine a mix of Evangelion (mechs vs aliens) and Gungrave (a main character who returns from the dead an is out for revenge) and you've got the idea of what AS' premise is like.
So if you like any of these series or even something like 'Code Geass', then I suggest giving Argento Soma a whirl