There's a new kind of forum for electronic musicians. Certainly not a rave, and not just a recital to earnest nerds, built on a kind of patronage, but a long way removed from a standard corporate gig where you're just providing the interchangeable soundtrack to X or Y product launch. The realm of the technology party, often seen at conference-festivals like Amsterdam Dance Event and Sónar, but increasingly as a standalone thing throughout global cities, is something very 21st century, very odd, and still to be negotiated.

Kate Tempest's long blonde-brown hair flailed as she prowled the stage, red-faced from exertion, adhering not a jot to the media’s tick-boxes for femininity. She is smaller, by far, than her backing band, dressed down in baggy sweatshirt and jeans. Unlikely star material yet she exuded such energized passion and righteous charisma that, by the end, as she encored with a poem that, like so many tonight, seemed to allude to the troubling political developments of last week, she had the audience rapt, completely engaged.

Ghostpoet – aka Obaro Ejimiwe – released his first album Peanut Butter Blues and Melancholy Jam in 2010. He has since been named as The Guardian’s New Band of the Day, nominated for a Mercury Prize and toured the festival circuit with the likes of Metronomy. His third album Shedding Skin, due to be released on March 2nd, was the focus of Pias Nites at Shoreditch’s Village Underground.

After three albums the question remains: is Die Antwoord more than a just a clever joke or is the act simply a caricature of South Africa’s trashy “Zef”-side? The guys and gal behind "Ninja and Yo-landi Vi$$er" are in no doubt – they claim to be “conceptual artists”. And many fans agree, saying that besides the posturing lie some real cultural truths. Last night three or so thousand descended on Brixton to make up their own minds.

Jack White (the former John Anthony Gillis) was born in Detroit and now lives in Nashville, a geographical progression you can hear in his music. He loves rude, dirty rock'n'roll but also has a fine instinct for country music, both of which tendencies are splurged all over this consistently inspired album (his second solo venture and the follow-up to 2012's Blunderbuss).

Even before Kate Tempest appears, it’s clear this isn’t going to be an evening of slam poetry jamming. Her band walk on, three guys who attack a line-up of electronic kit with vigour, one wielding drumsticks, alongside Anth Clarke, a striking black female MC, who looks like a 2007 nu-raver in baseball cap, white sunglasses and a crop top. They whip up a hammering electro racket before cutting out abruptly when Tempest walks on, all smiles, flowing blonde locks and a low-key black T-shirt. She breaks into “Marshall Law” from her Mercury Music Prize-nominated album Everybody Down.

Over the last few years, Riff Raff's rise – from ambitious, driven Houston rap scenester to reality-show opportunist to the alleged inspiration for James Franco's sleazily OTT white rapper in Harmony Korine's Spring Breakers – has been fascinating to observe. He's carefully parlayed low-level internet celebrity into his current, almost Gatsby-esque status as a self-actualised pop-culture avatar-cum-living meme, only the kind that steps out with the likes of Katy Perry. It's an impressive feat, especially when done without the aid of a conventional hit record.

She may only be 23, but Iggy Azalea got off to a good start with those of us a good decade older last month when the video accompanying her single “Fancy” - an homage to 90s teen comedy Clueless  - debuted online. Nostalgia sells, of course: any idiot with access to the nightwear department at Primark, where right now pyjamas featuring Alicia Silverstone and the rest share shelf space with My Little Pony, could tell you that.

It’s strange that probably most of the best-known Brazilian artists here are over 60 and from one state, Bahia - those being Caetano Veloso, Gilberto Gil, Maria Bethania and Tom Zé. Brazil is the size of Europe, though, and of course there are younger generations from other states. One of the leading new voices is Karol Conka, whose Brazilian electronica is as fresh as anything you are likely to hear this year.

The hip hop music of California has always been deeply stoned, and the wave of instrumental beats that have emerged from LA in recent years have taken this to quite some extreme. The scene around the Brainfeeder collective and Low End Theory club have, in fact, produced some of the most deeply psychedelic music of the 21st century, and Sam Baker aka Samiyam is one of the key figures within that.