Jon "Mags" Maguire is a Welsh songwriter and record producer.^[1] He has appeared on over twenty UK top 40 records,^[2] including four number one albums.^[3][4][5] He is best known for writing "You Are The Reason" with Calum Scott, ^[6][7][8][9] "Brother" with Kodaline and "Whistle" with Jax Jones.^[1] Jon has written and produced for artists including Sam Feldt,^[10] Kodaline,^[11][12] Scouting For Girls,^[13] Calum Scott, You Me At Six, Tiesto,^[14] Leona Lewis, Rita Ora,^[15] Jax Jones,^[16] Tom Chaplin,^[17] The Vamps,^[18][19]Lost Frequencies and Armin van Buuren.^[20][21]