I have a test where I am given the following article, what is an answer for the question: What types of singing does the vocalist for Meshuggah alternate between? ?

Meshuggah's experimentation, stylistic variation and changes during its career cross several musical subgenres. Heavy metal subgenres experimental metal or avant-garde metal are umbrella terms that enable description of the career of the band in general. Extreme metal crosses both thrash metal and death metal (or technical death metal), which are at root of the sound of Meshuggah's music, which has also been described as groove metal. The band has also been labelled as math metal and progressive metal. Meshuggah also incorporates elements of experimental jazz. In its review of Nothing, Allmusic describes Meshuggah as "masterminds of cosmic calculus metal—call it Einstein metal if you want". Meshuggah's early output was also considered alternative metal. Meshuggah creates a recognizable sonic imprint and distinct style.Trademarks and characteristics that define Meshuggah's sound and songwriting include polyrhythms, polymetered riff cycles, rhythmic syncopation, rapid key and tempo changes and neo-jazz chromatics. Hagström notes that "it doesn't really matter if something is hard to play or not. The thing is, what does it do to your mind when you listen to it? Where does it take you?" A trademark of Thordendal is jazz fusion-like soloing and improvisation. He is also known for the usage of a "breath controller" device. Haake is known for his cross-rhythm drumming with "jazzlike cadence". The vocal style of Jens Kidman varies between hardcore-style shouts and "robotic" death metal vocals.In polymeters typically used by Meshuggah, the guitars might play in odd meters such as 5/16 or 17/16, while drums play in 4/4. One particular example of Haake's use of polymeter is 4/4 against 23/16 bimeter, in which he keeps the hi-hat and ride cymbal in 4/4 time but uses the snare and double bass drums in 23/16 time. On "Rational Gaze" (from Nothing), Haake plays simple 4/4 time, hitting the snare on each third beat, for 16 bars. At the same time, the guitars and bass are playing same quarter notes, albeit in a different time...

"robotic" death metal vocals