Over thirty years ago, Fretwork made its first recording – well, technically speaking it was the second album to be recorded, but the first to be released – and it was called ‘In nomine’, which consisted mainly of 16th-century examples of this remarkable instrumental form.

In the Sanctus, at the words Benedictus qui venit in nomine Domini (Blessed is he that comes in the name of the Lord), the six-part texture is pared down to two and three parts; and then, with the words in nomine Domini, Taverner makes, for the only time in the mass, a complete statement of the cantus firmus, accompanied by three voices. This four-parts section – very beautiful as it is – must have struck contemporaries as some kind of perfection, to be used as a template, to be emulated and copied. And then those copies were copied and changed again.

Typically, an In nomine would have the alto, or second part, playing this cantus firmus in long slow notes of equal length. The other parts would weave counterpoint around it, sometimes commenting upon it, sometimes ignoring it. Typically, the cantus firmus starts and ends on the note, but there are many exceptions to all these ‘rules’.