The Black Pearl, for string trio, was commissioned by Ensemble Perpetuo in 2019, and was premiered at St Magnus Festival in Orkney. It was recorded on their album Reels, Drones and Jigs - https://open.spotify.com/album/3erQT4HxtffEXMAvjMDc3M?si=6Ux01pfPQgm7zJKC5M8vqg

The PDF download contains the full score and parts.

"Ailie Robertson’s string trio The Black Pearl tried to capture some of the lustre of the G minor movements of Bach’s Goldberg Variations, but it was its ragged quality which stood out; it was indeed the stand-out piece on the programme." - Bachtrack

"For Ailie Robertson’s string trio, The Black Pearl, some of the other musicians sat or stood around the back of the stage, lending an easy, communal atmosphere to this jazzy piece which added a more driving, suspenseful tone to the programme." - A Youngish Perspective - ★★★★★