This song is played by the Red Shadow Singers. This specific performance could be a celebration of sorts -- maybe a ceremony or prayer within the community. You can during the song that the performers do not care about how they sound, as long as its meaningful to them and the listener. This shows their spiritual strength. During the song, you will also be able to hear strong examples of vocables. They do this to communicate their message through song without limiting it to a specific language, so that it can be understood by anyone through the song itself, not having to rely on lyrics.
This selection features the Native American flute. The specific song was sung (or played) as a way to connect the rider with his horse. They would play this after a successful hunt or battle, signiying the strong connection between the two -- again, the rider and his horse, as they would be stronger together, and help each other.