Tuure Koski (b. 1969) has had time during his career to play in numerous groups and has thus gained merits as a talented electric and double bass player. Koski started his music career with piano lessons in a very young age but got interested in bass when he was 13-years-old. He started to study bass under Jakke Levo at the Pop & Jazz Conservatory of Oulunkylä and was accepted to the jazz department of Sibelius Academy in the beginning of 1990s. In 1992 Koski formed the famous XL-band with drummer Tomi Salesvuo, guitarist Jarmo Saari and vibist Arttu Takalo, which was a natural follow-up to the different rock bands he had been playing with earlier.

In the mid-1990s Koski was already an extremely busy musician, especially in the groups of many saxophonists, such as Jouni Järvelä, Janne Murto, Sonny Heinilä, Manuel Dunkel and Esa Pietilä. The most long-lasting post of these was with Manuel Dunkel Quartet where Koski played til the Manuscript album that was released in 2002. Koski has also been accompanying How Many Sisters in Kirmo Lintinen Trio since 1994 and performing with Antti Rissanen's Mr. Fonebone since 1998.

Koski graduated from Sibelius Academy in 1999 with Master's degree. In recent years he has been recording with i.a. How Many Sisters, Mr. Fonebone and singer-songwriter Laura Sippola. A slighly different recording session was with Radio Symphony Orchestra in Esa-Pekka Salonen's work Foreign Bodies that the prestigious Deutche Grammophon label released in 2005.