Mathcore is characterized by its complex and intricate rhythmic patterns, dissonant and angular melodies, and harsh and aggressive vocals. It does not typically emphasize traditional song structures.

Meshuggah, Periphery, and Animals as Leaders are all associated with the emerging trend of 'Djent' in rock and metal music, which is characterized by its use of heavy, distorted guitars with a focus on low-end frequencies.

Post-Metal is characterized by its atmospheric and ethereal soundscapes, slow and deliberate tempos, and clean and melodic vocals. It does not typically emphasize traditional heavy metal riffs.

Dream Theater, Tool, and Opeth are all associated with the emerging trend of 'Progressive Metal' in rock and metal music, which is characterized by its complex song structures, odd time signatures, and use of non-traditional instruments.

Blackgaze is characterized by its combination of black metal and shoegaze elements, atmospheric and ethereal soundscapes, and harsh and aggressive vocals. It does not typically emphasize traditional heavy metal riffs.

Suicide Silence, Whitechapel, and Job for a Cowboy are all associated with the emerging trend of 'Deathcore' in rock and metal music, which is characterized by its combination of death metal and hardcore elements.

Stoner Metal is characterized by its slow and heavy tempos, psychedelic and atmospheric soundscapes, and emphasis on traditional heavy metal riffs. It does not typically feature clean and melodic vocals.

Eyehategod, Crowbar, and Acid Bath are all associated with the emerging trend of 'Sludge Metal' in rock and metal music, which is characterized by its slow and heavy tempos, downtuned guitars, and harsh and aggressive vocals.

Doom Metal is characterized by its slow and deliberate tempos, dark and atmospheric soundscapes, and emphasis on traditional heavy metal riffs. It does not typically feature clean and melodic vocals.

Explosions in the Sky, Sigur Rós, and Mogwai are all associated with the emerging trend of 'Post-Rock' in rock and metal music, which is characterized by its use of non-traditional instruments, atmospheric and ethereal soundscapes, and emphasis on building tension and release.

Nu Metal is characterized by its combination of metal and hip hop elements, aggressive and distorted guitars, and emphasis on traditional heavy metal riffs. It does not typically feature clean and melodic vocals.

Tool, Faith No More, and Red Hot Chili Peppers are all associated with the emerging trend of 'Alternative Metal' in rock and metal music, which is characterized by its experimentation with non-traditional sounds and influences.

Industrial Metal is characterized by its use of electronic and industrial sounds, aggressive and distorted guitars, and emphasis on traditional heavy metal riffs. It does not typically feature clean and melodic vocals.

Nightwish, Epica, and Within Temptation are all associated with the emerging trend of 'Symphonic Metal' in rock and metal music, which is characterized by its use of orchestral and symphonic elements.

Power Metal is characterized by its fast and energetic tempos, soaring and melodic vocals, and emphasis on traditional heavy metal riffs. It does not typically feature clean and melodic vocals.