There was good news for Flight of the Conchords fans this week: Jemaine Clement confirmed, yet again, there wouldn't be another series.

Strange as that sounds, some things are so perfectly formed they are best left alone: Fawlty Towers and the English version of The Office... Great bands, too, deserve an enclosed lifespan.

The singles Free As a Bird and Real Love using the late John Lennon's home recordings simply tarnished the Beatles' reputation. And everywhere groups - often but a blip on the radar in their time - are reforming to trot out their hits, or hit.