The singing of Pentecost hymns is also central to the celebration in the Western tradition. Hymns such as Martin Luther's "Komm, Heiliger Geist, Herre Gott" (Come, Holy Spirit, God and Lord), Charles Wesley's "Spirit of Faith Come Down" and "Come Holy Ghost Our Hearts Inspire" or Hildegard von Bingen's "O Holy Spirit Root of Life" are popular. Some traditional hymns of Pentecost make reference not only to themes relating to the Holy Spirit or the church, but to folk customs connected to the holiday as well, such as the decorating with green branches. Other hymns include "Oh that I had a Thousand Voices" (""O daß ich tausend Zungen hätte"") by German, Johann Mentzer Verse 2: ""Ye forest leaves so green and tender, that dance for joy in summer air"…" or "O Day Full of Grace" (""Den signede Dag"") by Dane, N. F. S. Grundtvig verse 3: ""Yea were every tree endowed with speech and every leaflet singing"…".