There are multiple artists using this name. It also used as a placeholder name on last.fm:
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Undefined has had 6 concerts.
Undefined is most often considered to be Metal, Death Metal, Melodic Death Metal, Spanish, Progressive Death Metal, and New School Turkce Rap.
The last Undefined concert was on June 01, 2018 at Marquee Theatre in Tempe, Arizona, United States. The bands that performed were: Authority Zero / after the calm / Madd Dog Tannen / Undefined.