Björn Daniel Arne Yttling (born 16 October 1974 in Umeå, Sweden) is a Swedish music producer, songwriter, and musician. His production and songwriting credits include Lykke Li, Chrissie Hynde, Primal Scream, Franz Ferdinand, Sahara Hotnights, Anna Ternheim. Yttling is the bassist of the indie rock trio Peter Bjorn and John. He is also a co-founder of the label and artist collective INGRID and a member of the band LIV.

Source: Wikipedia (https://en.wikipedia.org/wiki/Bj%C3%B6rn_Yttling)