Heartbound is noted to contain a more symphonic metal influence in their overall sound.

This album is very different from their previous releases as it features a small amount of screams and black metal influence.

Although the band started their migration towards a heavy metal influence, this album still retains the band's roots.

Romantic lyrics and soft keyboard melodies show gothic metal influence.

According to him, "the mixed-up metal influences were part of an exit strategy".

Many youth crew bands had a strong heavy metal influence.

The claimed to have taken a black metal influence and mixed it in with their already hardcore sound.

The song has been noted for having a considerable thrash metal influence.

"Revolution, Baby" also stood out as the most genre-busting track for having hard rock and alternative metal influence.

Some critics have talked of a black metal influence in imagery.