You know the place called Elbphilharmonie in Hamburg? Years ago, I thought I had achieved what any young musician dreams of doing: I was performing on the biggest stage in Germany for a sold-out audience. I was over the moon excited when I was driven to my dressing room; with a view overlooking the river, I felt like a superstar. I was a featuring guest of a famous rock group and was supposed to sing an operatic solo with the main singer of the group. But when it came the time to bow, I…