“I was just released from the hospital…the doctor told me that the medicine can’t do me no good. They told me what I have is beyond medical science…he told me that what I have is more serious than cancer. He told me what I have is a very, very bad case of the blues. I found out the best remedy for the blues is to be with the one you love.”

The cape, the banked-up synths and the glam have gone. Rick Wakeman’s Grumpy Old Christmas Show consists of just the man, his piano and his stories and jokes, mostly about Christmas and family.

“Trance boogie,” states My Baby frontwoman Cato van Dijck before submersing herself in the rising tribal rhythm of “Sunflower Sutra". Trance boogie is, indeed, what My Baby do. The song is decked with floating flecks of glissando guitar from virtuosic New Zealand bandmate Daniel Johnston on the other side of the stage. “Sing with me, brother,” Cato demands with a smile and behind his drum kit her sibling Joost leans into his microphone and harmonises. Behind it all is a housey four-to-the-floor beat, but their sound is all organic groove.

Abba fans can already have an immersive dining/dancing/singing experience at the O2 in Mamma Mia! The Party, and now, almost as a companion piece, is ABBA: Super Troupers The Exhibition, a show that sets out tell “the story of the band, their music and the era they defined”.

That's a pretty tall order and I'm not sure – even as a dedicated fan – that Abba defined an era, but on the other two points this multimedia exhibition makes a decent go of it as it describes the group's history from first meeting to eventual break-up, and beyond.

As the number of sweaty bodies increased towards the front of the Barrowland stage, IDLES singer Joe Talbot had a direct message. “Keep safe” he implored on several occasions, like a concerned dad warning his kids, or perhaps a shepherd guiding his flock. For all that IDLES are a rowdy, raucous live band, there is undoubtedly a caring side too, evidenced throughout a night that was part rock gig, part good time party, and occasionally a wayward turn into a karaoke club.

The O2 is usually a bright, sterile space before the bands come on. Its starkly lit US sports event ambience is accentuated by humanity milling around layered plastic seating clutching giant tubs of soft drink. Not so tonight. The venue has been open for three hours before the headline act is due. The lighting is purposefully dingy as 2ManyDJs and James Holroyd spin techno-flavoured sounds, warming up the crowd.

Natasha Khan is ending this intimate UK tour where her dreams first took shape. Study at the University of Brighton began 12 years in the bohemian town, and her twice Mercury-nominated, mythology-minded pop life. She could sometimes be found here in St Bartholomew’s, a vaulting Victorian temple with the supposed dimensions of Noah’s ark, all sunken shadows and glinting gilt, tucked just off London Road’s grubby shopping bustle.

In the liner notes to the new reissue of 2001’s All is Dream, Mercury Rev’s Jonathan Donahue says it is “a weird astral album musically, and yes the symbolism lyrically runs many layers down and deep – different coloured layers of rock, soil and ash on an archaeology dig.”

“Are you ready to do battle with us?” bellows Johan Hegg, Amon Amarth’s imposing yet cheery frontman, immediately prompting an enthusiastic roar from the packed-out Brixton crowd. “GOOOOOOD!” He’s the most genial Viking you could imagine - six-foot plus with a gigantic beard and massive hair, a drinking horn holstered on his thigh, and a huge smile plastered across his face.

Grimes, the Canadian art pop performer, made headlines last week when she predicted the end of musical performance as we know it on a podcast interview with theoretical physicist Sean Carroll. Live music, she said, would be “obsolete soon”, while she gave a window of a couple of decades in which artificial intelligence would become “so much better at making art” than human creatives.