Saku Solin, known professionally as Shag-U, is a Finnish singer who is currently a member of industrial metal bands Turmion Kätilöt and Fear of Domination.

Solin has been the singer of Fear of Domination since the band's founding in 2006.

[1] In March 2017, he temporarily joined as a member of Turmion Kätilöt to replace Spellgoth, who left the band.

[2] In August, it was announced that Solin would remain permanently as the second singer of Turmio Kätilöt.

[3] The album Universal Satan released in 2018 is the first on which Solin's voice can be heard.