Like other liturgical seasons, Lent has its own special rules, and there are certain things that should not be done in Lent.
Here are 6 of them . . .
1. Instrumental music with no singing
In some parishes, instrumental music is used at certain points during Mass. A passage will be played on an organ or on another instrument or instruments, even though nobody is singing.
But not in Lent (with a few exceptions).
The General Instruction of the Roman Missal (GIRM) states:
313. 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.
2. Singing or saying the Gloria
Just after Sunday Mass begins, it is common to sing or say the Gloria (“Glory to God in the highest”).
But not on the Sundays of Lent.
The General Instruction states:
53. The Gloria in excelsis (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.