Leonard Cohen, who has died aged 82, is known to most people through his epic song Hallelujah, external. It took him years to get it right and he later described the process as "banging his head on ...

What do Bono, Susan Boyle and Jon Bon Jovi have in common with Jeff Buckley? For better and for considerably worse, they are amongst the hundreds of musicians to have covered Hallelujah, the song ...