The Roundhouse is a melee of moneyed cosmopolitan twentysomething trendies. The beautiful people are out in force. My God, there are some delicious women and men here, expensively dressed, uptown couture to the hilt, a hefty smattering of languages from around the globe. Unexpectedly, for me at least, 22-year-old Chilean-American electronica prodigy Nicolas Jaar has the most chi-chi gig in London tonight. This is not a plus – the queues at the bar are half-an-hour long, dilettante party people buying rounds of exotic shots and bottles of bubbly, waving wodges of tenners about.

The Chemical Brothers have long had one of the most vital shows around. It’s a visual spectacular that can only be likened to peak-time Pink Floyd or Jean-Michel Jarre, yet precision-tooled, without the bombast of those acts. Their long-term visual designer, Adam Smith, is mostly responsible and now he’s shot a concert film of the electronic duo’s appearance at the Fuji Rock Festival in Japan last year. Smith has directed a few bits and bobs before, notably the BBC adaptation of Little Dorrit, and he’s the perfect choice to take the Chemical Brothers experience into the cinema.

Laura Veirs may be increasingly seen by some as an “undiscovered gem”, but to others she still comes over a bit too corn-fed to warm to. Of course, the much applauded Year of Meteors and July Flame contain some mighty pretty moments, but there’s also a sense that they belong to a slightly smug American West-Coast eco-culture. But now, recent mother Veirs has released an album of “children’s folk songs,” gaining rave reviews. Would last night's show find her fuzzy and huggable, intimate, or just a little too worthy?

Last night was one of those occasions when I found myself looking forward to seeing the support band more than the main act. This wasn’t because Senegal’s sublime Orchestra Baobab haven't delivered a transportive heart-warming set of Cuban and soukous grooves every time I’ve seen them live. It was simply because Belgium-based Congolese rapper Baloji made Kinshasa Succusale - one of my favourite albums of last year.

Soweto Kinch's set last night as part of the eXplorations mini-series featured gluttony, envy and a host of other vices. No, not A Life in the Day of an Investment Banker, but a tantalising glimpse of Kinch's take on the Seven Deadly Sins.

Before The Beatles touched down there in 1964, British pop was barely a concern for America. The first in this three-part series took The Beatles arrival as the year zero for British pop’s conquering of America. An entertaining canter through an over-familiar slice of pop history, Go West was enlivened by some top-drawer talking heads including Paul McCartney and Jimmy Page. No Rolling Stones though.

I first heard Zed Bias's Biasonic Hot Sauce – Birth of the Nanocloud last autumn. He may have been one of the key players in the London-centric sound of UK garage, but he was never of that scene. Based in Milton Keynes through the first phase of his career, he releases through a Brighton label and is now resident in Manchester.

It would be easy to begin with a reflection on how little the world has changed in the 100 years since the birth of Woody Guthrie; to draw parallels between the Great Depression and our own troubled economic times. Yet en route to last night's “Woody at 100” celebrations at Glasgow's Celtic Connections festival, I realised that to do so would constitute a disservice to undoubtedly one of the most important songwriters of the 20th century.

It’s about the bass and the drums. The choirboy high vocals and sugary melodies catch the ear first, but they’d be so much soufflé without the room-shaking, stomach-wobbling bass throb, the Chic-style disco drumming and its tsk-tsk-tsk hi-hat shuffle. Combined, the soft and airy, the propulsive and grounded make the audience move. Not tap a toe, but actually move – dance.

Folk music is about roots and place and while rootedness can provide a welcome balance to the vagaries of a virtual and globalised world, it can also raise some less salubrious spirits: the British folk movement expresses at times a folksy form of insularity, in which place or nation are made just a little too sacred and exclusive. The Cecil Sharp Project, which emerged out of a week of workshopping sponsored last year by the Shrewsbury Folk Festival, avoided these pitfalls with a great deal of deftness, a sense of irony as well as a dose of humour.