Mark De-Lisser is a voice coach, lately a media one, making heart-warming reality shows in which he builds community choirs to beat loneliness, or the solitude of dementia, or just to soften the condition of being human. Many benefits are psychological, in a space beyond (but passing through) mindfulness, where you make your heart sing by singing. But there are physical benefits, too, from posture to breathing to a muscular skeletal reboot, which is why I’m in De-Lisser’s studio – though I want my heart to sing as much as the next man.