Both parts are of equal importance, and this can also be performed as a flute and clarinet duet (clarinet part provided).
The titles are:
Jinglin' Janglin' Bells
God Rest Ye Swingin' Gentlemen
Hark the Herald Angels Scat Sing
Deck the Halls with Swingin' Music
Good King Wenceslas Freaked Out
Silent Night Bluesy Night
We Three Swingers.