There are 3 artists named Notch.

1) NOTCH is a Reggae/Dancehall/ Reggaeton artist who released the album The Feeling, featuring the single "I Wanna Kool You". http://www.rockfort.com/

2) Notch were an electronic band from Gothenburg (formed in 1994/95), Sweden with Johannes Hedberg, Daniel Ringström, Mikael Lindqvist of bands such as Carbon Based Lifeforms, DigiDroids and Thermostatic.

3.Notch (UK) is an alternative/synthpop/experimental artist in London who has written solo material since the mid-80s and has been invoved in various projects under names such as Trisexual,Nexus,Nippon Death and This Aching Body.He was also the organ/keyboard player in the London post-punk band Seizure, throughout the 90s.
His songs are available here as Notch (UK)

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Artist biography from last.fm