This is where the delirium kicks in. Tired but happy, the attendees started the third day of Sónar festival slightly boggled by how to pick and choose from the strange delights on offer. Saturday was when the true musical variety of the festival was displayed: straight-up hip hop to eye-popping South African tribal dance displays, balmy ambient revivalism to apocalyptic techno, heartbroken electronica to deranged prog rock: it was all on offer...

Certainly a good cross-section of people were in attendance for the first day of Sónar.

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

While rumours of the album's demise may well have been premature, the digital age certainly does present increasing challenges when it comes to getting punters to keep and treasure music. Of course, really it all went wrong with the CD: those irritating plastic cases with hinges and catches guaranteed to snap off and get hoovered up, the booklets you have to squint to read, the discs that slide under car seats or behind radiators. Even “deluxe collectors' editions” were never going to be all that glorious compared to a big slab of vinyl or two and a lavish gatefold record sleeve.

There's something about this album that feels as if it's already existed for a long time. Full of post-apocalyptic images of smoke, dust, decay and weakness, and themes of struggling individuals and implacable political forces, it thematically fits with the works of a long line of acts who positioned themselves against the fear of nuclear armageddon and the seemingly immovable Conservative government in the 1980s. Its mix of Caribbean-influenced soundsystem culture and dub poetry with an edgy alternative experimentalism, too, harks back to the post-punk genre collision of Dennis Bovell, On-U Sound, Renegade Soundwave and the like, 25 or more years ago.

The Detroit electro-techno duo of James Stinson and Gerald Donald aka Drexciya never gave away their secrets easily. Almost completely anonymous and never photographed during their 10-year existence – which ended with Stinson's 2002 death after a long illness – they surrounded their music with a complex mythos and mischievous wit comprehensible only to a small, obsessive cult audience. Only now are they getting wider appreciation, with a new generation of electronic musicians like Rustie hugely influenced by their sparse electronic funk, and the art world being introduced to their conceptualism via the work of the Turner Prize nominated Otolith Group.

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.

It's only after hanging up the Skype connection to Richie Hawtin that I realise how effective a branding exercise he has made the interview. In conversation the English-born, Canadian-raised Berlin resident is charming and smart, but listening back I realise that he has subtly repeated the names of his projects and products over and over, with the slickness of a high-flying salesman. But then you don't sustain a 20-year career making relentlessly odd music - yet still be regularly ranked in the very top flight of global club DJs alongside perma-tanned monstrosities more likely to be seen schmoozing Madonna or the Black Eyed Peas than in an underground rave bunker - without knowing a few tricks of the trade.