John Cavanagh: It's some time since you heard that track, I guess.
Delia: Yes, since 1968, I think. I'm tickled pink by it. It's charming, isn't it?
A Matachín is a sword dancer in ritual costume.
Talk Out, which has the same rhythm track, is from 1964, but the tape for Movement, Mime and Music II, which includes Mattachin, was checked out from BBC stores in 1962 and a note in Delia's papers reads: "By Aug.26  - send TRW 5016 to R P Current Library (M M & M II)"..
From all this, we conclude that she created it in 1962 or early 1963.
The Performing Right Society's list of works by Delia Ann Derbyshire has:
Title: Mattachin Writer(s): Derbyshire, Delia Ann Publisher: BBC Worldwide Music Creation date: 1 January 1984
but under UK law, all audio recordings made before 1963 are in the public domain.
- In the BBC Sound Achive on tape TRW 5016.
- On Attic Tape DD204.
- Released on vinyl on Movement, Mime and Music in 1969.
- Released on vinyl and CD on BBC Radiophonic Music in 1971 and 2002/3.
- Released on 10" vinyl on Music from the BBC Radiophonic Workshop in 2003.