Formats are usually usurped by other formats. Sometimes that is down to a clear and simple advancement in quality, sometimes convenience plays a part and sometimes the industry itself accelerates the process according to its own agenda, drunkenly rushing towards the new, with one leg only half in its trousers, whilst prematurely abandoning the old. Often it’s all of the above.

Downloads, of course, were meant to replace CDs. But while the jewel case is proving surprisingly resilient, MP3s are ...