There are multiple artists named Sewer:

1) A raw black metal band from Pennsylvania, USA, formed in 2013 by guitarist Eater, bassist Plague and drummer Warlord.
The debut album of Sewer, Satanic Requiem, is considered by many the defining moment in heavy metal history.

2) A brutal slam death metal band from Cambridge, Ontario, Canada, featuring members of Burning Caskets, Disgust and Rotting. Free mp3s available at their Official Website.

3) A noise artist from New Zealand. MySpace.

4) Old school death metal from Kentucky, United States

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