Actually, with the list above, it's not that hard to Google up the clips, using the song title + artist name.
When I checked Mudcat for what had been posted, Supersearch must have been glitching, because these are in the DT, substantially as sung in the clips:
Didn't My Lord Deliver Daniel
Go Tell it on the Mountain
I'll Hear de Trumpet
Mighty Lak' A Rose
Now Let Me Fly (chorus differs on clip)
Sorry about that. Still, I would not be sure we have ALL the lyrics for those songs, as they might be shown in spirituals songbooks.