When rewatching parts of the wedding of WA and Max, I stumbled upon 'Ave Maria' sang during the church ceremony. According to commentators this was one of the requests of Max, as it was apparentely standard at Argentinian weddings. Well I have heard it a regular, common Dutch weddings also. Even in one the Ave Maria was song by the bride herself (she was a trained singer and is a speech therapist by occupation). I thought it was also something typical Catholic, but I have seen it at some other faith weddings too.
Made me curios if it was played at other royal weddings too, and I wasn't dissapointed.
Ave Maria - Schubert: https://en.wikipedia.org/wiki/Ave_Maria_(Schubert)