The hymn book Galata Waaqayyoo contains 329 songs:
Source: Stefan Ritter collection
Also available as an App (Google Play):
Galata Waaqayyoo
(by Waktola Merdassa)
Video
hymn no. 66 [Nu maari yaa uumaa keenya nu gargaari]:
ยป See overview of Oromo hymns (work in progress)