ABBA in the recording studio with their long-time sound engineer (and later, producer) Michael B. Tretow. He was often called "the fifth member of ABBA", credited with helping create their classic sound.

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ABBA in the recording studio with their long-time sound engineer (and later, producer) Michael B. Tretow. He was often called "the fifth member of ABBA", credited with helping create their classic sound.
Europe - Wings of tomorrow
1984
…but the actual playing room, it was super dead, you know. There was no reflective surfaces…in there, I clapped my hands and the clap just went into the palm of my hand, it didn’t extend…and ‘oh dear, what’s my guitar amps going to sound like in here?’, and ‘oh, what are the DRUMS going to sound like in here?’ And so, it was a little bit of a challenge…because there was no ambience, the drums weren’t necessarily sounding so much like an acoustic instrument any more. For the very first time in Led Zeppelin’s recording history, the front skin came off, then we started recording like other people had done. We’d never sort of done that up to that time and we were hearing ambience through the headphones because there wasn’t any in the studio and it was sort of fake, coming from a machine…But it was interesting. I felt it reminded me of being a studio musician again, it was weird, because of the nature of it. But it was good, we got some good stuff done.
Jimmy Page on ITTOD and recording at Polar Studios, July 2015