It's always interesting to see how revolutions in music get folded back into the fabric of the culture that fomented them. Dubstep, which changed club culture so dramatically in the mid-2000s, is now an intrinsic part of that culture from mainstream to margins, and the forms it takes as it beds into these various parts of the ecosystem are manifold. And Jazzsteppa – two Israelis named Gal and their trombones – turn their hands to a fair few of those forms.

Thursday 23 June

Haven’t left yet but someone sends me an email saying, "Not going to Glastonbury this year and feeling rather smug about it." What are they feeling smug about? The fact that they’re going to have a forgettable, normal weekend while this extraordinary event is going on? It is, of course, to do with ideas of rain. A lot of the pre-Glastonbury coverage focuses endlessly on rain and mud, as if home comforts are everything. When did comfort become the big cultural draw?

Dubstep has now permeated pop. Drum and bass was the last British underground bass music to rub up against the mainstream but back in the mid-Nineties the major labels didn't know what to do with it. Apart from launching Goldie's career and leading David Bowie up another excruciating dead end, it failed commercially. Dubstep, on the other hand, has been eagerly embraced by US stars - Jay-Z, Rihanna and Britney Spears, to name three - and UK acts such as Chase and Status, Skream, and Magnetic Man have stormed the charts. This assimilation is invigorating but sometimes, when the latest dubstep-flavoured Euro-pop nugget hits the airwaves, one pines for the raw deal. This is where Joe Muggs steps in.

This month sees an audacious attempt to showcase British dancehall music, when the Cargo venue in Shoreditch hosts the multi-artist revue Showtime!. The Heatwave collective have brought together vocalists from various UK underground scenes, linked by a strong influence from the high-energy Jamaican sounds of the past 30 or so years. While many of the artists involved have found success in crossover scenes like rave, jungle, grime and garage, the appeal of dancehall itself (also known by the overlapping terms bashment and ragga) has traditionally been restricted to predominantly black audiences.

This is, not to put too fine a point on it, a masterpiece – but it could easily have been a bloody mess.

It's been a while since I've spent time with Asian Dub Foundation. In the mid-Nineties, when they first appeared, they were one of the most exciting acts around and I enthused about them in print at every opportunity. They were born of an east-London community music project, mashing up the then-new sounds of drum and bass with agitprop showmanship and anti-racist politics. The result was a visceral live act that fitted as well beside the rising Brit-Asian wave (Talvin Singh, Nitin Sawhney, Badmarsh & Shri, etc) as with punky post-Levellers roots rock.

Katy B has something of the everygirl about her. Part of her appeal is that, unlike Ke$ha, The Saturdays and so many other female pop stars, she hasn't embraced pole-dancer chic, nor does she appear to be gagging to be spread over the pages of Heat pondering her love life, her diet or her cleavage. Katy B is a 21-year-old from Peckham who looks like a 21-year-old from Peckham.

Why do bands still insist on dabbling in drum’n’bass? It was always an absurd, overwrought style, even when it first assaulted our eardrums in the mid-1990s. It’s more like a technological malfunction of the drum machine than a natural, felt groove, hurtling along, as it tends to, at a ridiculous 200 beats per minute. Ironically, Marseilles’s Watcha Clan probably think it’s one of their strengths that they throw a couple of tracks into their live set powered by this anachronistic rhythm, but they are much more effective when utilising less familiar grooves.

Carl Craig is extraordinarily easygoing. Most dance producers of his seniority and level of achievement would come with at least a publicist in tow, but when we meet him in his London hotel, his only entourage is his nine-year-old son, playing happily with an iPad or chatting to the photographer as we talk, and Craig is very easy and engaging company.