The world's most prestigious arts festival has added two more rock musicians to its line up for its August 2015 programme.

Richard Reed Parry, from Arcade Fire, and Byrce Dessner, from The National, will perform alongside the Scottish Chamber Orchestra (SCO) on 28 August, as part of the Russian Standard Vodka Hub Sessions.

The two, whose joint composition for string orchestra Wave Movements was announced previously for this concert, will now also take to the stage with members of the SCO to perform Heart & Breath.

This piece, which has been composed by Reed Parry, will feature Bryce Dessner on guitar and Richard Reed Parry on bass.

Another addition to this event is Murder Ballades, a score based on American ballads about murder, composed by Dessner.

It was originally created as a score for L.A. Dance Project who appeared at the Festival in 2013.

The appearance of the duo marks another signal that the EIF, under its new director Fergus Linehan, is to embrace a wider range of music this year and the future.

Alongside traditional classical music, orchestras, ballet and opera, Linehan has programmed singer songwriter Sufjan Stevens, Sparks and Franz Ferdinand, and King Creosote for this year's festival.

Linehan said: "To me the artists in this series represent some of the freshest and most creative minds in contemporary music.

"The International Festival has a rich history of presenting outstanding musicianship and we are thrilled that the Russian Standard Vodka Hub Series will offer festival goers a wide range of genres and styles in a wonderfully intimate venue."