17 hours ago Mark Savage Music correspondent Getty Images With heartfelt songs and relatable lyrics, Noah Kahan has been called "Gen Z's older brother" and "Folk Malone" A couple of hours before we meet Noah Kahan in a vacant suite of his fancy West End hotel, he posts a video of a new song, called Porchlight. So it's with a little trepidation that we greet him a couple of hours later. Is there a safe exit route if he's caught short? Should we ensure a plentiful supply of bananas? Luckily, it turns out Kahan was just teasing his fans. "The bathroom has really good acoustics," he laughs, "and I always think it's funny to be sitting on the toilet playing music. My fans seem to like it when I talk about poop and stuff, so it's a good way to mix music and bathroom humour." But if there's a better first introduction to Kahan, I can't imagine one. He's an unlikely music sensation, whose rootsy songs of restlessness and belonging captured TikTok's Gen Z romantics.…