Listen to O Come, All Ye Faithfull Adeste Fidelis online. O Come, All Ye Faithfull Adeste Fidelis is an Unknown language song and is sung by Christmas Piano Music All Star. O Come, All Ye Faithfull Adeste Fidelis, from the album Christmas Piano - Christmas Jazz Piano Music, Piano Music for Christmas, was released in the year 2010. The duration of the song is 0:55. Download Unknown songs online from JioSaavn.