[4] In between his studies, Seim spent a year in nearby Denmark, during which time he began a short-lived group with pianist Carsten Dahl and became increasingly influenced by the playing of Dexter Gordon.

[4] Seim's jazz education was supplemented by participation in New York jam sessions during his frequent overseas trips to visit his father, who worked in the Norwegian diplomatic service.

[6] Seim became a member of Jon Balke's band Oslo 13 in 1992[3] and soon after was instrumental in forming the jazz quartet, The Source, with fellow Trondheim Musikkonservatorium alumni Øyvind Brække, Mats Eilertsen and Per Oddvar Johansen.

[11] Receiving positive reviews upon release, Different Rivers won the German Record Critics Prize, "Jahrespreis – Preis der Deutschen Schallplattenkritik" in 2001,[1][2] and began Seim's long association with ECM Records, both as a leader[12] and as a sideman, including for Jacob Young,[13] Manu Katché,[14] Iro Haarla,[15] Sinikka Langeland,[16] and Mats Eilertsen.

[31] With 1300 Oslo With Jon Balke Batagraf Bodega Band With Mats Eilertsen With Harr & Hartberg With Iro Haarla With Manu Katché With Sinikka Langeland With Håvard Lund With Geir Lysne Listening Ensemble With Motorpsycho With Odd Nordstoga Og Det Norske Kammerorkester With Jørn Skogheim With Squid With Christian Wallumrød With Petter Wettre