Of all the unlikely songs to top the pop charts, right up through Oliver Anthony’s “Rich Men North of Richmond,” Harry Chapin ’s 1974 hit “Cat’s in the Cradle” remains singular, and singularly unexpected. Even during an era overrun with story-songs, of which Chapin was a master, “Cat’s in the Cradle” stood apart. Here was a chamber-folk ballad that started with a squiggly sitar-guitar effect, then launched into a tale of a man lamenting all the times he was too busy to interact with his son —