“They’re some of the greatest pop songs ever written,” declares Sir Elton John. He’s right. The Bee Gees – Barry, Maurice and Robin Gibb – are responsible for songs that will live forever, songs that are part of successive generation’s cultural furniture. Yet although the title was The Nation’s Favourite Bee Gees Song, the question asked on the ITV website was: “Just what is the greatest Bee Gees song ever?” Favourite and greatest aren’t the same thing. They can be, but they aren’t.

Clever people often make terrible music. Not always: the best pop is smart as well as direct - but an inability to stop analysing, comparing and explaining is the anathema of the pleasure principle, and encyclopedic knowledge often leads to bone-dry discourse.

Glass crunches underfoot. It’s been raining constantly, but the odour reveals that a fair amount of what's in the cobbled street's central gutter is urine. Everyone appears to be drunk. The French equivalent of crusties aren’t content with one dog-on-string. Some have four. During the annual Trans Musicales festival, Saturday night in and around the Place St-Anne of Brittany’s capital Rennes is a keep-you-on-your-toes experience.

When theartsdesk last saw folkie Swedish sister act First Aid Kit, they were both still teenagers. It was a dank February night and they beguiled a tough Edinburgh club with voices that sounded like they belonged somewhere in A Midsummer Night’s Dream. But that was almost two years ago, a long time in the life of one teenage girl, let alone two. That evening, our reviewer wrote, “Hope filled the air, like the scent of freshly cut grass.” Last night, as I stood backstage waiting for a pre-show chat with the girls, I worried that after months on the road some of that artless charm may have become jaded.

About a year ago, when I saw Gorillaz’ sensational show at the O2 Arena in London, one of the highlights of the evening was “To Binge”, the duet between Damon Albarn and Yukimi Nagano, the Swedish-Japanese singer with the Swedish band Little Dragon. It was a fabulous moment - a song drenched in emotion, Albarn on his knees, Nagano’s voice swooping and soaring.

In the age of Skype and no-frills budget travel, frontiers barely exist – at least if you’re not an immigrant or refugee. World music is as much about boundary-breaking and fusion these days as it is about discovering the unsullied treasures of what UNESCO calls the "intangible heritage". Contemporary global sounds can feel like an opportunistic marriage between musicians who have little in common, or else a more appropriate union with some basis in cultural kinship or history.

Kate Rusby’s Christmas show was a brilliant way to get that festive feeling. Standing on a stage lit by three huge glittering stars and a collection of colourful glowing baubles, she and her band (“the boys”) worked their way through a surprising and heartwarming selection of traditional carols, set to unusual tunes and with creative flare.

A Hawk and a Hacksaw began a decade or so ago as a solo project, when Jeremy Barnes stopped drumming with indie-folk cult heroes Neutral Milk Hotel. It was with the 2004 addition of violinist Heather Trost, however, that the sound was found: a peculiar, and occasionally mariachi-tinged, take on East European folk.

It catches everyone out that Duran Duran’s version of the hip-hop classic “White Lines (Don’t Don’t Do It)” comes off so well. Not just affable entertainment but actually fiercely funky, raising a large section of the Brighton Centre to its feet. Duran’s 1995 covers album Thank You – from which the song comes - was once voted by Q magazine as the worst album ever, but looking around at the enthused reaction, including my own, that all seems rather irrelevant. Midway through their set, Duran Duran are a persuasive force.

If anyone tells you that Deep Purple’s Concerto for Group and Orchestra (1969) wasn’t a masterpiece then they’re an idiot. In fact, it was, more or less, the only successful use of an orchestra with a rock band ever. Now, 40 years on, a pensionable Purple have hit the road again with a full symphony orchestra. But they’re not playing the Concerto. They’re playing their hits. Critically, they’re performing them without founding keyboardist, Jon Lord, and guitarist, Ritchie Blackmore.