There's a book of interviews with John Cage by Joan Retallack called Musicage that was finished the summer that he died, in 1992. And in one of the last interviews, he was very excited to talk about nanotechnology. There's real technophilia from him, a kind of utopian embrace of the idea that nanotechnology will free people up to do what they really want to do.

Chance in music doesn't have to involve the I Ching or rolling dice or throwing yarrow stalks. It can involve an out-of-tune guitar, or other impossible-to-replicate moments of awkwardness - even more so than an awkward, out-of-tune live performance, because there's something incredible about the way that an out-of-tune guitar becomes part of the song on a record. I won't be precious and say it's part of the composition - that's nonsensica l - but chance occurrences are so crucial to what's distinctive. It's the fingerprints all over so many of these recordings.

Records have always been the most extraordinary form of time travel for me, and that's why it matters to know when something was circulated, and if it had an audience of five or 50,000.

My experience that undergirds that observation comes from punk, where people might have scraped together the money to be in the studio for an afternoon to make a record. Punk isn't a music that you think of as chance-based, but exigency has a lot to do with it.

Otherwise the history just gets completely flattened out, and people imagine that everything was always available and accessible. One of the things that struck me was the way in which the landscape of experimental music seemed different at different points in time, on the basis of where one was situated geographically, if one had access to live performances, and what was released at a particular time.

The question of art songs always came up with Gastr del Sol. I think Jim O'Rourke had it right in being clear that there's a tradition of art song - Ives being the touchstone for the two of us - and what we do doesn't belong to it. It wasn't important to advance those kinds of distinctions, but clearly he thought it was fanciful for anyone to speak of what we were doing as being in that tradition.

As there are more online archives of improvised music, it becomes more like the daily practice of playing it. It lessens the idea of there being masterpieces of improvised music through benchmark recordings.