Jussi Tiainen (born January 12, 1995), known professionally as costee (stylized entirely in lower-case), is a Finnish singer-songwriter. Originally a member of the Turku-based duo Sima, he began his own solo career in 2018. He participated in Uuden Musiikin Kilpailu 2025, where he ultimately placed sixth. He has been nominated for two Emma Awards. Biography costee was born on January 12, 1995 and grew up in Turku. He was gifted the drums by his father when he was 8, and soon became interested in music. He subsequently began playing the guitar.
He first came to attention in 2014 when he became a member of Sima, a duo based in Turku, with his high school friend Mathias Hermansson. The duo first began by creating indie music, but became focused on dance-pop.
He subsequently debuted as a solo artist in 2018. His solo music features themes of Finnish rock and emo rap.
He was named a YleX top breakthrough artist in 2019. That same year, he released his first album. It charted on the official Finnish charts for 74 weeks. As of 2026, he has created four albums. In 2024, he went on a national tour.
His music often discusses topics such as mental health. He has stated that he feels happy when he hears that his songs are able to help people struggling with the things he's facing. Many of his fans tattoo his lyrics onto their bodies.
He is also a songwriter who has written for Samu Haber and Lauri Tähkä. He appeared in and helped write songs for Alan Wake 2. He also composed the theme song for Reindeer Mafia.
He has been nominated for two Emma Awards, for Best Newcomer and for Audience Favorite. He has also founded his own record label, Tuhma Music.
He participated in Uuden Musiikin Kilpailu 2025 with his song Sekaisin. He ultimately placed sixth in the final round with 83 points, losing to Erika Vikman.
Discography +AlbumsTitleYearHighest Chart Position on the Official Finnish ChartsNumber of WeeksPublisherNää pirut on mun kavereit2025414Warner Music FinlandKaikki Vampyyrit Ei Juo Verta2022513Warner Music FinlandKaikki Loppuu Aina2020217Warner Music FinlandEhkä Joskus Tää Viel Naurattaa2019674Warner Music Finland +SinglesSongYearHighest Chart Position on the Official Finnish Charts Single ChartNumber of WeeksKöyhä ja kipee (feat. BESS)2025262Epäreilu maailma (with Jemina)2025301Sut tahtoisin2025175Sekaisin2025512Miten sut mielest poistetaan2024144Sano vaan2024274Silt se tuntuu (feat. Tupe.)2024163Anteeks (feat. Fabe)2024163Rakastunut Suruun2023312Tytöt2023362Kuolen Vähän Joka Kerta (Heviteemu ft. Costee)2023471Kyynel (Feat. Tippa, Heviteemu)202281Olen Muistanut202272Älä Pyydä Mua Takas Enää202282Levottomat Tuulet (with Adi L Hasla)202236Elämä On Hetken Ihanaa2021201Ne Voi Liittyy (Feat. Bizi)2021161Nuori Edelmann202192Taas Sun Kaa2020122Kunnes Kuollaan2019181Satuta Mua Kunnolla2019201Pakoon pahaa oloo2018N/AN/A
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