Lyric discussion by retron23 

Cover art for Let Forever Be lyrics by Chemical Brothers, The

I'm pretty sure the correct lyrcs are "scream a symphony", and "to be a crystalline". Yes the grammar sounds weird, but I think it's part of the overall psychedelic wording such as "How does it feel like" and "to make it happening".

Overall, this seems like the majority of all Chemical Brothers songs, to be about the psychedelic experience and mind altering hallucinogenics. As many have pointed out, it bears some resemblance to the Beatles psychedelic classic "Tomorrow Never Knows", a song that the Chemicals often used to play during DJ sets.

I sincerely doubt it's about meth, and not just because I don't think the line is "crystal fiend" (and definitely not Cristophe, whatever that's supposed to refer to.) It's just not keeping in character for the Chemicals to be that sardonic and cynical with a single lyric during what's otherwise a beautiful kaleidoscopic soundscape. And as the British poster above noted, Noel Gallagher probably wouldn't add that kind of lyric himself.