Jean-Pol Dub - guest instrumentalist (didgeridoo) on "Touching the Void"

Mixing Bands for Effect This year, Midsummer Night Swing features more orchestras than ever, many with well-known guest instrumentalists and vocalists.

The DoonaiRrala Ad Hoc band had a guest instrumentalist among their number: Artos, the Gringg lutanist.

But then the set became a kind of talent show, as D.J. Spooky brought on guest instrumentalists and rappers of widely varying abilities while the audience trickled away.

(Additional drummers have appeared on some of the albums, along with a smattering of guest instrumentalists and singers.)

The programme also showpieces certain sections of the orchestra and features guest instrumentalists, for example the BBC Big Band.

Two years later, they released the Dovetail on Klein records, featuring a horn section and several other guest instrumentalists.

The single was the first release by Pendulum to feature either a guest instrumentalist, or a guest vocalist.

Apart from Jones' trademark vocals, fingerstyle guitar and fiddle, the records also introduced guest instrumentalists playing piano, harmonium, bodhran, melodeon and recorders.

Metaphra also use guest instrumentalists such as saxophonist Gustave Savvy.