Today I was complaining that it bothers me that most of the times the Gloria is omitted during the early Mass on Sunday morning. I was told as by a parishoner and by a deacon that the celebrant can omit it on Sundays of ordinary time. I looked at the GIRM and the only thing that I see is that the introductory rites can be omitted or celebrated in a particular way only in certain celebrations that are combined with Mass according to the norms of the liturgical books (GIRM 46). My understanding is that It 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.t (GIRM 53).
Does anyone have a reference to any document that it shows that it can be omitted on Sundays of ordinary time?