Russian-born, Los Angeles-based singer and songwriter Polina has co-written hits for a wide variety of artists, and has appeared as a guest vocalist on dance tracks by numerous top producers. She's contributed to songs by Sean Kingston and Eminem, and was featured on Felix Jaehn's 2015 single "Book of Love," which topped the German airplay charts. Additionally, she has sung on tracks by Tiësto, David Morales, Steve Aoki, and others. As a solo artist, she records dramatic electro-pop as Contessa and dance-pop under her first name, including several Russian-language songs as well as English tracks like 2021's "Faena" and 2023's "Crave."