Liturgy is the way we worship God with words and actions. It often involves music. Music and other art forms are the ways we express ourselves and we can praise God with them. Music is a personal taste. Some like Gregorian chant, some prefer 19th century hymns, some prefer sacred music of the rock or rap genres. It would be a dangerous move to claim that because Pope Francis prefers a certain style of music, so does God. I have heard God worshipped with many different kinds of music. I have chanted, taken a part in polyphony and waved a hand in the air to modern worship songs. Diversity of music represents diversity of culture and long may we enjoy it.