جيرنشيم In Memoriam, Op. 91

In Memoriam, Op.91 or In Memoriam (Ein Klagegesang/Klage-sang für Streichorchester und Orgel) is a piece for solo organ and orchestra composed by Friedrich Gernsheim in 1915. It was first published that same year in Berlin. The piece is in G minor and has an average performance time of 6 minutes.