"This album has multiple covers and titles; it seems to be barely official. This is Coltrane’s last tour with Davis. He didn't want to go. His career had already started. He is sulky and petulant on these shows. His playing is edging towards the more raucous howl of his later revolutionary period. The night before this show he was booed in Paris; Miles would leave the stage during his solos. In Stockholm, eight minutes into ‘All Blues’, Coltrane does a remarkable thing. He hits a split note, a strangled harmonic that is clearly unintentional. He plays the same mistake a second time, and I would be prepared to venture that this second time was also accidental. Then he plays it a third time, then a fourth and fifth. It could be that he is going for the rule that if you play a mistake, then you should play it again and it becomes a part. You underline it and make it seem intentional. But it’s more than that. Coltrane is fascinated by this tortured phrase. He becomes obsessed with what his saxophone is doing, or rather what it isn't doing. He is going into a trance and circling the five notes again and again, sometimes with the smallest changes, sometimes repeated in different ways, but always this curious, odd, raspy note in the middle. The audience doesn't exist. It is just him and this one phrase. In total, he repeats the line 33 times. I just counted. The band goes with him as well, from initial worry to uncertainty and finally to outrageous confidence. It is both the dumbest and most intelligent piece of music I've ever heard, and I think about it all the time when I'm making records. It speaks about the power of repetition, the beauty of pure experimentation, and what you can get away with if you show confidence."

"I'd gotten into The Gentle Good after hearing his previous record, which was called Tethered For The Storm, which was lent to me by one of my neighbours back in Cardiff. That's how I switched onto him. I still love the accidental way you sometimes just get into music. He made this record when he took a trip to China because he'd become obsessed with the story of a Chinese poet called Li Bai. So Y Bardd Anfarwol is the immortal poet, basically; he has that west Walian edge to his music. He is a folk musician, even if I don't know if he'd like to be described as such, and this album has lots of Chinese musicians on it and it really is dealing with the myth and reality of this poet, and when he becomes a hermit. There's songs on there which are absolutely lovely. I like it when someone buys into a record; they jump into it, and they travel to another country, and they think: "I have to do this. I have to follow the path of this record." I'm not a great lover of world music - I'm not a great authority on it - but this was sometimes I could buy into; it was a smash-up which was enchanting. I love the fact he went from The Gathering Storm to this; it was a lovely seamless step that he made, and it's that kind of thing where I'm so entranced with this album, and it is a record that relaxes me, which is rare for me. I'm intrigued to see where he goes next, and that's lovely - it's the feeling you had when you're 15, and you go out and buy a third album from an artist and as soon as you finish digesting it you think, "God, I wonder what they're gonna do next." I kind of have that feeling with this guy."

"There is certainly a rasp to my voice [LAUGHS]. It's not quite as bad as Bonnie Tyler's but it is raspy. Rod Stewart wasn't a big influence on me as a singer though. I don't really sound like anybody. In the same way that Ozzy doesn't sound like anybody or Alice Cooper doesn't sound like anybody. You get these boyband singers now that are all very similar. Even in the old days, you could swap round some of the Motown singers and you wouldn't really know the difference. Singer wise, I loved Mark Bolan; Noddy Holder; David Bowie; Alex Harvey; Russell Mael; Steve Harley; Brian Ferry; Sammy Hagar; Phil Lynott. All that lot go into a bucket but I still don't sound like any of them [LAUGHS]. Mutt Lange was a huge influence on my singing: he can play anything, do anything. He was pushing and pushing. I remember the first time I ever met Lou Gram from Foreigner. He said: 'tell me, did Mutt make you feel like you couldn't sing either?' and this was fucking Lou Gram, right? He'd make you do it again and again. He would push and push until you'd be right on the edge of losing it. Sometimes that worked and sometimes you felt like your spirit was being destroyed. Physically, you're going into spaces in your head and your chest cavity that you've never been. But he would've done it with anybody: look what he did with Brian Johnson, he put him through the bloody ringer with Back In Black but look what he got out of it. And that's why I don't complain. Rod Stewart was the first album I ever bought with my pocket money. The version of 'I'm Losing You' is just genius but my 'in' to that record, as it were, was 'Maggie May' because it was all over the radio at the time. It was rock but it was pop rock: it's not been influential in terms of how we sound but I absolutely love it."