The perpetually jotting gang over at Moleskine is celebrating the fiftieth anniversary of the audio cassette—developed in 1962 by a crack team of music lovers at Phillips—with special versions of the Milan-based company’s beloved notebooks. The limited-edition Moleskine Audio Cassette Books, introduced today, have covers that reproduce the front panel of a tape recorder (on the large notebook, available in ruled and plain versions) and a portable player (pocket notebook). Inside the pocket are “retro mini-stickers,” and die-hard tape lovers can download a cassette-shaped pocket that can be printed and glued to the notebook.