Shenandoah (American folk song) easy chord strum guitar mouth organ lesson with chords and lyrics

This is my arrangement of the American folk song Shenandoah.
My strumming pattern: (I use a thin plectrum)

Count: 1 2+3+4+ (repeated)
DDddddd

Count 1: downstroke on top 2 or 3 bass strings
2: slower downstroke emphasising all strings then a quick
downstroke on top bass strings.
3: two quick downstrokes
4: two quick downstrokes
Maybe a slight variation here and there.

I am playing a key C major Lee Osaka mouth organ. The tab is as follows:

C FC F G7C
3444-45-5-65 7-7-66-6656

F Em Am F
6-6-6-6565-44

C F C F C G7 C
34 34-55 4-45-55-44-44

I played the melody on the same guitar. I produced the bass line and other accompaniment to my guitar strumming and mouth organ playing within GarageBand.

"Oh Shenandoah" (also called simply "Shenandoah" or "Across the Wide Missouri") is a traditional American folk song of uncertain origin, dating to the early 19th century.
The are many different versions of the song and many more artistes whom have recorded it.
The song appears to have originated with Canadian and American voyageurs or fur traders traveling down the Missouri River in canoes, and has developed several different sets of lyrics. Some lyrics refer to the Oneida Chief Shenandoah and a canoe-going trader who wants to marry his daughter. By the mid 1800s versions of the song had become a sea shanty heard or sung by sailors in various parts of the world.