7. How Are Churches Decorated During Advent?

The General Instruction of the Roman Missal notes:

During Advent the floral decoration of the altar should be marked by a moderation suited to the character of this time of year, without expressing in anticipation the full joy of the Nativity of the Lord. During Lent it is forbidden for the altar to be decorated with flowers. Exceptions, however, are Laetare Sunday (Fourth Sunday of Lent), Solemnities, and Feasts.

 8. How Is Music Performed During Advent?

The General Instruction of the Roman Missal notes:

In Advent the use of the organ and other musical instruments should be marked by a moderation suited to the character of this time of year, without expressing in anticipation the full joy of the Nativity of the Lord. In Lent the playing of the organ and musical instruments is allowed only in order to support the singing. Exceptions, however, are Laetare Sunday (Fourth Sunday of Lent), Solemnities, and Feasts.

9. Is the Gloria Said or Sung During Advent?

Neither. The General Instruction of the Roman Missal provides:

[The Gloria or "Glory to God in the highest"] is sung or said on Sundays outside Advent and Lent, and also on Solemnities and Feasts, and at particular celebrations of a more solemn character.

10. What Private Devotions Can We Use to Grow Closer to God During Advent?

There are a variety of private devotions that the Church has recognized for use during Advent. The most famous is the Advent Wreath.