Hymns are one of the permitted options for those particular parts of the liturgy, so where they appear we have a duty to sing, in the same way as the other mass parts, the ordinary of the mass, and any antiphonal responses between president and people.
I take issue with this part of the GIRM. I suppose that maybe I shouldn’t, because it only applies to the Ordinary Form of the Mass, but I wholly disagree with the notion that it is anyone’s “duty” to sing during the Mass. Except for maybe the Ordinaries - it is definitely ideal that people sing those if they are able - but for anything else, I absolutely reject the notion that it is somehow not sufficient worship if you are not singing. This would go against a lot of years of tradition in the Church and would imply that what people are doing at a sung Mass in the Extraordinary Form is “less ideal” or that their worship is somehow deficient; which if this was true, first of all the EF Mass as it is widely celebrated today would probably no longer be allowed, but most of all, it would seem to discount the experience of so many souls in the past, including the (probably vast) majority of our Church’s canonized saints. Shoot, and also the experience of a growing number of people today who are attracted to the EF Mass. Maybe I’m being defensive/making a molehill out of an anthill, but this is the problem I personally have with fully appreciating the OF Mass - there are people out there so set on making it a completely different experience than what the EF Mass was/is, which I do not believe for one second was the intention of the Council or the promulgation of the OF. (Disclaimer - please don’t interpret this as me saying I think the OF is invalid or whatever - these are just some things I struggle with.) All I’m saying is, one shouldn’t have to be required to go the Extraordinary Form of the Mass in order to experience something similar. I don’t subscribe to the notion that the Ordinary Form was meant to be (or is) a break with the traditions of the Old Mass, or was meant to be a totally different experience, though I know that reforms were intended.
Going back to the GIRM and its options, yes, there are options laid out. Gosh, I could go on and on and on about this, and I did in my first draft of this response…lol. I will just say, fine, no one (ok, nearly no one) disputes that hymns are allowed to replace Propers. The real question is not “is this allowed?”, but “should this be done?”. That is, why isn’t it common sense that one does whatever he can to make sure the texts
proper to the day are used; why is little to no effort being given to using the texts actually designed for the day? I highly recommend the following article from ccwatershed (and this also contains a wonderful video about Sacred Music/what the Church allows):
ccwatershed.org/blog/2012/mar/15/general-instruction-roman-missal-chant/
Going back to having a “duty” to sing everything, I apologize if you did not mean to argue for that - I am very passionate about the the topic of the Church’s Sacred Music and sometimes can read a little too far into people’s statements. I do agree, as stated above, that for the Ordinaries and short responses (Amen, And with your spirit/et cum spiritu tuo, etc), one should sing if able (and that’s the closest you’ll get me to saying it’s one’s “duty” to sing), but I will always, always argue that there is so much to be said about just listening, and that it is very possible for
everyone to more actively participate by listening than singing,
most especially for anything other than the ordinaries.