There is often a wish expressed for 'so-and-so' to get back together (after sometimes bitter bust-ups) and create more of the material that made them popular. Is it possible for a partnership not just to re-form and play the old hits - but to recapture the old creativity and produce new work of the same or better standard as the old?

Or is it a case that great creative collaborations can only spark the once?

Are there any examples of past differences being put behind and this creative spark being able to happen more than once?