"MY VOCAB PRACTICE."

1. Unison.
   The choir all sang in unison, the song written by the Choir Director, as the piano player played along.

2. Sonorous
   When we went into the theater, the orchestra's sonorous notes permeated through the rafters with beautiful melodies.

3. Sonic boom.
   When she saw The Concorde take off for the last time, she waited for the sonic boom as it reached even higher in the sky.

4. Dissonance.
   The dissonance between the protesters and the politician giving his speech was deafening.