PeR (short for Please Explain the Rhythm) is a Latvian pop and beatboxing band formed in 2007. The original line-up was Ralfs Eilands, Emīls Vegners, and Pēteris Upelnieks. With Vegners leaving in 2007 and Upelnieks in 2011, the band became a duo consisting of Ralfs Eilands and Edmunds Rasmanis. PeR represented Latvia in the 2013 Eurovision Song Contest with the song "Here We Go".
