Guitarist and lead vocalist for the Australian rock band 5 Seconds of Summer. Their debut single "She Looks So Perfect" topped the charts in Australia, New Zealand, Ireland and the UK. Their debut self-titled album peaked at #1 in 11 countries.
He started uploading YouTube videos of himself singing in 2011.
In 2012, he released the EPs Unplugged and Somewhere New with 5 Seconds of Summer. In 2015, his band was nominated for two Billboard Music Awards.
Louis Tomlinson promoted the 5 Seconds of Summer song "Gotta Get Out" in 2012, which helped the band gain popularity.