John Carl Adam Grahn (born 4 November 1984 in Karlskrona) is a Swedish rock singer, songwriter, and guitarist.

[4] He himself enjoys many bands such as Metallica, Tom Petty, U2, Crosby, Stills and Nash.

In 2007 he founded the band "Royal Republic" along with three other students Hannes Irengård (guitar), Jonas Almén (bass) and Per Andreasson (drums).

"Royal Republic and the Nosebreakers" with songs from the previous albums re-interpreted in an acoustic and country-like way was released in 2014.

[8][9] Royal Republic are active on the touring circuit in Europe and the United States.