Voice crossings are common, when he wrote for more than one voice (most of his music is monophonic).
Voice of America | The Village Voice | Crossing Jordan | Voice acting in Japan | voice-over | voice acting | voice | The Voice | border crossing | His Master's Voice | Voice acting | Voice of Russia | The Voice UK | The Voice of Holland | Voice over IP | Washington Crossing the Delaware | Transatlantic crossing | Napoleon Crossing the Alps | Animal Crossing | The Voice (U.S. TV series) | Interactive voice response | Global Crossing | George Ball (voice actor) | European Voice | You're the Voice | Voice-over | Voice for Life | The Witches' Voice | The Voice (TV series) | The Voice of Ireland |