Maybe my memory is playing tricks, but I seem to recall that Beirut had more of a swagger in their step, in their playing, and in their demeanour when I last saw them four years ago. It was at the Roundhouse, it was packed, and Zach Condon and his band were on an upward trajectory following the release of their acclaimed album, The Flying Club Cup; they moved with ease and oozed a sort of blowsy bonhomie.

Friday 9th September

There are some acts you’d rather not catch in a concert hall. The relatively recent pairing of King Creosote and Jon Hopkins isn’t, however, one of them. Diamond Mine, their seven-year project, is a deceptively serious piece of art that prefers to be listened to closely and without distraction. It may have been one of the more obscure nominees at this year’s Mercury Prize, but that recognition has resulted in an album that could easily have slipped quietly by, gaining fans fast. And last night those fans found themselves immersed in Diamond Mine’s meditative soundscapes whilst, on stage, one eccentric and one prodigy gave a masterful demonstration of the benefits of perseverance.

John Grant’s Queen of Denmark was released less than 18 months ago. Yet here it is, already being performed at one these "so-and-so plays such-and-such an album" shows. Does it merit this treatment? Based on last night, yes. This one-off reunion of Grant with his patrons, Texas’s Midlake, lit the Festival Hall with the beauty and literate miserabilism of his songs. In jeans, suit jacket and a T-shirt, Grant strolled on stage and the audience erupted in applause. He’s touched a chord.

While the physical and mechanical elements of its production are common to all, the sound of a person's voice is as individual as a fingerprint. Launching her Brazilian-themed solo album Lágrimas de um pássaro (Tears of a Bird) in the intimate surroundings of Soho's Pizza Express Jazz Club, Heidi Vogel's extraordinarily rich and complex vocal timbre proved capable of completely seducing the senses.

I'm not quite sure why Anthony Kiedis bothered to put on his multicoloured frock coat. It certainly wasn't to keep warm. The atmosphere in Koko was positively volcanic even before the Red Hot Chili Peppers appeared on stage at this exclusive Radio 1 showcase. Highlights are due to be broadcast during Zane Lowe's show on 12 September from 7pm to 9pm, but a radio airing will convey only a miniscule fraction of the zip of this age-defying band.

While obviously not as seismic a Top of the Pops moment as Ziggy singing “Starman”, the almost contemporaneous appearance of the flat-capped Gilbert O’Sullivan hunched over his piano as if it were a dying coal fire certainly stuck in my memory as clearly as Bowie’s androgynous space-age carrot-top. Although the flat cap was quickly ditched in favour of casual knitwear and even a hairy chest phase (see pic below), today’s 64-year-old Mr O’Sullivan feels that his fate in the shape of his image was sealed all those decades ago, and he’s been fighting ever since to transcend it.

In a black dress, Caro Emerald is playing her UK debut. Behind her, an eight-piece band is squeezed onto the Jazz Café’s small stage. Snappy and pin sharp, they’re in black suits, white shirts and black ties. Except the guitarist, who’s jacket-free. Three brass players are ranged behind music stands. Nothing is overstated. Emerald races through her jazz-grounded pop, the rumba-ish “A Night Like This” ending a set that filters filmic swing through a current pop sensibility.

Luke Haines, Cabaret Voltaire ****

If the cards had fallen differently Luke Haines might have been as big as Blur. As frontman of The Auteurs he was briefly tipped for Britpop greatness, so it is no surprise that he likes the idea of alternative histories. This special show, The North Sea Scrolls, was all about them, as Haines, former Microdisney linchpin Cathal Coughlan, writer Andrew Mueller and cellist Audrey Riley mixed spoken word with punchy lo-fi melodies.

Adam Riches, Pleasance Courtyard ****

From the moment Adam Riches bursts onto the stage, spewing his business cards around as a manic showbiz agent who wants to sign up everyone and everything - including even the venue's walls and floor - this is a show of hyper energy and absurdist comedy.