Karen Harding was discovered on YouTube by MNEK before the pair teamed up to co-write the Top 10 hit Say Something. Here, Harding recalls the fateful train journey, text message and two-word title that helped change her life...

I was at a point in my career where I thought it was never going to happen. I was living in my hometown of Consett, near Newcastle, working in a band and waitressing part-time. My mam wanted me to go to ...