Instrumental Duet Flute,Instrumental Duet,Trombone - Level 3 - Digital Download SKU: A0.783803 By Lady Antebellum. By Johnny Marks. Arranged by John Groves. Christmas,Holiday. Score and parts. 3 pages. John Groves #6597433. Published by John Groves (A0.783803). A Holly Jolly Christmas - arranged for Flute and Trombone Duet.