313. [...] 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.
83. c) the organ only may be used at Mass, and Vespers for the sole purpose of supporting the singing. (De Musica Sacra)
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