Teacher forms a transgender choir to help singers adjust their vocal chords while they are transitioning

The Butterfly Music Chorus based in Boston is reserved for transgender singers who don't feel welcome in traditional choirs and they are currently gearing up for their first public concert.
http://www.dailymail.co.uk/news/article-3350702/Finding-voices-Teacher-forms-transgender-choir-help-singers-adjust-vocal-chords-transitioning.html