Lundvik also has a singing and songwriter career having composed songs for films and the Wedding of Victoria, Crown Princess of Sweden, and Daniel Westling in 2010.

In the same contest, he represented the United Kingdom as one of the songwriters of "Bigger than Us" performed by Michael Rice, which finished in 26th place (last).

In 2005, Lundvik was a member of the 4 × 100 metres relay team for IFK Växjö, which earned a bronze medal at the 2005 Swedish Championships.

[4] Lundvik started his musical career in 2010, composing the song "When You Tell the World You're Mine" for the wedding of Victoria, Crown Princess of Sweden, and Daniel Westling.

It eventually won Melodifestivalen, represented Sweden at the Eurovision Song Contest 2019 in Tel Aviv, Israel in the second semi-final.

On 16 February 2020, it was announced that Lundvik was one of the songwriters that composed "Mon alliée (The Best in Me)", the French entry for the Eurovision Song Contest 2020.