Cello,Instrumental Duet,Violin - Level 4 - Digital Download SKU: A0.1302713 Composed by Wade, Reading, King John IV of Portugal. Arranged by Brenton Edgecombe. Christian,Christmas,Holiday,Religious. 2 pages. Adelaide String Duo #892328. Published by Adelaide String Duo (A0.1302713). Violin and cello duo (duet). Also known as 'Adeste Fideles' this is one of the most loved of all traditional Christmas songs.