Westminster Chorus - 2 part warmup exercise (listen for OVERTONES/harmonics)

There are only two notes being sung at a time. Yet, when the voices line up correctly, you’ll hear octaves, fifths, and even and thirds. The final interval is a perfect fifth - (Only two notes being sung!), yet, you’ll clearly hear a four part chord. (Keep in mind, this is being sung outside, with the worst acoustics possible!) These ’extra’ notes are naturally occurring “harmonics“ that are always being produced by your voice at all times, but are amplified significantly when the voice is completely free