In 1995, he changed to the class of Pavel Gililov at the Hochschule für Musik und Tanz Köln.
Sigfridsson has worked with many European symphony orchestras and has performed under such renowned conductors as Vladimir Ashkenazy, Lawrence Foster and Dennis Russell Davies.
[2] He plays chamber music with Gidon Kremer and Ivry Gitlis and trio with Sol Gabetta and Patricia Kopatchinskaja.
In July 2000 he won the 2nd prize and the audience award at the Concours Géza Anda in Zurich.
In 2001, he received the Förderpreis des Landes Nordrhein-Westfalen für junge Künstlerinnen und Künstler [de].