Couple of thoughts:
To get to the full length opera videos:
On your MacBook in itunes, if you go to Browse > Genre > Classical, if you scroll horizontally through the main carousel, you’ll come to the big yellow Deutsche Grammophon box with the ‘Your home for the best of the iconic Yellow Label’ caption. Click on this. As well as being able to access some (not even close to all) of the DG playlists, if you keep scrolling down you’ll get to the Video Albums which have the currently available DG operas.
To get to all of DGs playlists:
Scroll to and click Featured Curator: Deutsche Grammophon.
The Sonos app on your MacBook won’t allow you to search for Deutsche Grammophon directly. However if you add an album or playlists to your iCloud Music Library either in mac iTunes or iOS Music, you can then access it from Apple Music > My Music > Recently added in the mac Sonos app.
When listening to Apple Music music via iTunes or iOS Music, make heavy use of the Like/Dislike options under the ... button at the end of the track name. AMs initial assumption seems to be that everyone like current chart pop, rap and urban music. It will need top ‘learn’ your taste in order for the For You tab to start filling up with music you’re likely to like and have less of the stuff the ‘taste makers’ think everyone ought to like.
You can re-run the ‘Genres and artists I like’ exercise again on iOS by going to For You > click on your profile picture > scroll to the bottom of the page >. View Account > Find More Artists and Curators.
When playing a track, especially from a playlists, and you like it, click the artist/performer name in red - you get the option of going either to the artists in question, the album the track is from or the playlists the track is being played from. I’ve wound up adding so many albums of works to my library this way, both new and familiar.
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Finally, try following DG on Apple Music; this will ensure that DG’s regular posts and suggestions pop up on your For You page (helpfully drowning out the stuff you don’t want to listen to). Search for Deutsche Grammophon in All Apple Music> Click on @dgclassics then click the Follow button.
It is difficult to defend AMs interface either on mac or iOS. However one you get enough works liked/disliked and albums/playlists/artists added to your Library, it becomes tolerable especially when you’re lost in the music that become progressively easier to find in your own library.