The spiritual power of music cannot be overstated. The thrill and emotional ecstasy of voices joined together in song is one of those human experiences that transcend boundaries and ideologies. On Sunday mornings this joyful noise rings from the rafters at the Holy Spirit Parish Episcopal Church, when Holy Spirit Choir director Nancy Cooper leads her tuneful flock. Cooper is an accomplished organist who has performed at the highest levels at events in the United States, Canada and Europe. Even more of an accomplishment: This marks the 40-person choir’s seventh Best of Missoula award in 10 years.