If the records that I make have one thing in common, it's that there is little recapitulation, and the idea is that it should end in a place very different from where it began, and that you've heard musicians undergo a change or be irreversibly transformed.

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.

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.

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.

Kenny Goldsmith from Ubuweb describes himself as an amateur archivist, and people can download files from Ubuweb - it's not a streaming service. But it's a miracle that it's still online and they're able to make it work through the donations of server space and volunteer efforts.

If the records that I make have one thing in common, it's that there is little recapitulation, and the idea is that it should end in a place very different from where it began, and that you've heard musicians undergo a change or be irreversibly transformed.

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.