There are at least 4 artists/groups going by the name of Gen.
1. Gen aka Mark Wilson (UK) got famous for releasing a couple of tracks for Fokuz Rec in the years of 2003/04 . Highly melodic and atmospheric , a real gem in the "sunrise-drum and bass" story.
2. GEN is a folk duo consisting of the good doctor Alex Hiatt and the Young Gentleman JT Ketterer. They live in a beautiful cottage in scenic Saginaw making films, music, pictures, and comedies. Contributors and Provokers consist of: Erik Helwig and Samantha Krueger. Gen's influences include Lortanzo Sorefingers and Jady's Ricket. Gen have released an album called "Exascebartion Clorve."
3. Gen was a Christian rap-metal/nu-metal band from Birmingham, England. After winning a Battle Of The Bands competition, they travelled to the United States to record their debut album "Rite Of Refusal". They have since disbanded.
4. Gen is a spanish street punk band from Zaragoza. http://www.losgen.com/
There is also a metal band named "Gen Dos" that should have a separate page, but unfortunately does not.