"The avant-garde comes to the mainstream. At the time, Terry Riley was an avant-garde composer. He still is, but he's probably more so known for his work in the late '60s. Indian music at the time was coming into focus because of The Beatles and psychedelic music. So his compositions - especially this one - were really hypnotic, very mantra-esque. I think Terry Riley influenced more in a pop sense than in a rock sense, and I think A Rainbow In Curved Air has probably equal influence to Sgt. Pepper's. And you can quote me on that! It's obviously where The Who got the name 'Baba O'Riley', where the band used synthesisers - that's from Terry Riley. We cut our teeth in Buffalo, NY, in the early '80s and in that time the place was at the height of avant-garde. They opened a music school where they featured all the greats - Terry Riley, Steve Reich and Tony Conrad - just a ton of avant-garde composers, who later became more famous. It was such a central point for the electronic avant-garde movement, one that hadn't been around since San Francisco in the late '60s. It influences everything that Grasshopper and I do. We have strange polarities of the melancholy, romantic side of us. Then we also have the avant-garde side of us. The rock & roll side of us is probably the least prominent in our music. One of our albums, Snowflake Midnight, is also our homage to that bygone era of electronic music. Once you put it on, you think, ""Oh that's where all that William Orbit and Moby stuff comes from."" If you look all the way back, that's Terry Riley. It was the beginning of synthesisers, arpeggio synths also, which eventually became modern dance music. It was his motif of making it more hypnotic."

"With the compilation albums, I am cheating. It meant I didn't know which album to choose. I sometimes DJ. When I DJ, I use a system to take people into an ecstatic trance through music. I might start with Brian Eno and some ambient music and then move to other genres. I might use classical music or Indian music. But, invariably, when I get to the third rhythm of trance and when I really want to take people into that state, I am almost forced to go to Underworld again and again. Underworld brought together song and dance in a way that I have not heard anyone match. The Chemical Brothers are great and New Order are obviously great, but Underworld take me to a tribal edge that is so ferocious and yet, simultaneously, so intelligent. 'Rez' is one of my favourite songs – even though that is not one of their most tribal. 'Moaner' and 'Born Slippy' are their more tribal tunes. I find their textures and landscapes and vocals – which don't get in the way and help you lose yourself when you are dancing – make Underworld difficult to surpass. I was so proud of them when they got to do the Olympics in 2012. I felt that was their due. I contacted them before the Olympics and had a lovely communication with them. I told them that I thought they were the most revolutionary and iconoclastic band of the last 20 years. Then, about a year later, Danny Boyle used them during the opening ceremony. I saw them play recently at the Hollywood Bowl and I danced so much that I badly twisted my ankle and couldn't walk for about two weeks. It was still worth it. Dancing injuries are to be worn like medals of honour."