The song is described as a high-energy blend of power metal, symphonic rock, and marching band elements.
If you're looking to add this to a playlist, would you prefer the used in the anime, or the full 5-minute version ? I can also suggest where to download it safely. Review: The Rumbling – SiM - Music Talkers Attack On Titan Op 1 Mp3
It is considered one of the most effective anime songs for increasing motivation, described as a "masterpiece" that gets viewers energized. The song is described as a high-energy blend
While some find the full version to have too many dramatic shifts compared to the edited TV version, the opening sequence is regarded as a flawless match for the show's intense atmosphere. Review: The Rumbling – SiM - Music Talkers
Here is a review based on fan consensus and critical reception: Musical Analysis