A song and an obsolete device, connecting three generations. — “Hey, what’s this?” Sarthak asked his mother, Prerna. He was holding an old, battered-looking, and dust-ridden, square device. “Oh my God, I can’t believe it’s still here.” Prerna heaved a deep sigh and held her hand to her fourteen-year-old son. Perplexed, Sarthak handed it to her while asking, “But what…