How 'The Happy Song' captures the imagination of an 18-month-old baby

‘The Happy Song’ is precision-engineered by a corporation to delight babies — and it works, says Mark O’Connell.

THE song I listened to most this past year was ‘The Happy Song’ by the English singer-songwriter Imogen Heap. I didn’t play any other songs by Imogen Heap last year, or any other year.