1) Sirens are Newcastle Upon Tyne based R&B, pop and hip-hop girl band, known best for their Top 50 single, “Baby (Off the Wall)”. They have released three albums so far ("Control Freaks", "Say Goodbye to LA LA Land", "#3 : Opium Apathy").
2) From Bath in the UK, Sirens are an alternative/hardcore band formed by Theo Saunders and Jack Mumford-Turner. Their most recent release was the 5-track EP 'The Last Six Years' from June 2015 which followed 2013's 'We've Still Got Mountains Left To Climb'. Read more on Last.fm