[1] In 2012, Horne prepared the chorus for Simon Rattle's concert performances of Gershwin's Porgy and Bess at the Philharmonie with the Berlin Philharmonic.

He also conducted performances in the opera houses of Bordeaux, Cardiff, Malmö, Tel Aviv and at London's ENO.

[3] Horne has been chorus master and conductor at the Hessisches Staatstheater Wiesbaden since the start of the 2014/15 season, where he is responsible for the preparation of the opera chorus, and also conducted productions of Bernstein's Candide, Puccini's Madama Butterfly and La Bohème, as well as Mussorgsky's Boris Godunov.

In 2023, he conducted the world premiere of Søren Nils Eichberg's Oryx and Crake, as well as the New Year's Concert and a revival of Puccini's Il trittico.

[citation needed] During the 2023/2024 Season in Wiesbaden, he will be conducting a new production of Stephen Sondheim’s Follies (starring Pia Douwes), a symphony concert with the Hessisches Staatsorchester, and performances of Verdi's Otello.