 Through the years, Janson has collaborated with artists such as Aqua, Backstreet Boys, Benny Andersson, Bernard Purdie, Brenda Russell, Britney Spears, Céline Dion, Cody Karey, Eddie Harris, Emilia Mitiku, Il Divo, Katherine Jenkins, Kelly Rowland, Maceo Parker, Max Martin, Michael Bolton, Michael Ruff, Nils Landgren, Paul Potts, Peter Jöback, Pink, Randy Brecker, Robyn, Ronan Keating, Roxette, Take That, The Tenors, Toots Thielemans, Westlife and Arch Enemy.On 5 December 2013 Céline Dion released the song "Breakaway" as a single in the UK.Her album, "Loved Me Back to Life", also includes "Somebody Loves Somebody", both songs with string arrangements co-written by Janson.