Having a way to filter by groups of tag values in a convenient manner would be a nice to have. This is one of the things that keeps me on MusicBee, which uses a "tag hierarchy" template to allow users to create their own filters which can be interacted with using a sidebar. For example: (from my hierarchy based on Rate Your Music's)
Genres
Ambient
Ambient::genre
Ambient Americana::genre
Dark Ambient
Dark Ambient::genre
Black Ambient::genre
Ritual Ambient::genre
Space Ambient::genre
Tribal Ambient::genre
Blues
Blues::genre
Acoustic Blues
Acoustic Blues::genre
Acoustic Chicago Blues::genre
Acoustic Texas Blues::genre
Jug Band::genre
Piedmont Blues::genre
...
If someone selects Ambient, Blues, or Dark Ambient's group, it'll filter to show all tracks that have all the genre tags (denoted by ::genre) in the selected group, including subgroups in the case of Ambient/Dark Ambient.
It's worth pointing out that MusicBee also allows for custom defined tags - I'm not sure if Astra allows this but it's worth pointing out. Someone has used this to make a template for filtering by country.
Describe alternatives you've considered
Quod Libet allowed filtering using queries, and I wrote an app that converted groups in MusicBee tag hierarchy templates to queries, however large queries simply crashed the app. Tauon Music Box had "generators" but I was not able to get along with it.
Additional context
Someone had tried to do a PR on my template converting it to JSON. This may help if a relationship-based model would be preferred to a hierarchical model.
Having a way to filter by groups of tag values in a convenient manner would be a nice to have. This is one of the things that keeps me on MusicBee, which uses a "tag hierarchy" template to allow users to create their own filters which can be interacted with using a sidebar. For example: (from my hierarchy based on Rate Your Music's)
If someone selects Ambient, Blues, or Dark Ambient's group, it'll filter to show all tracks that have all the genre tags (denoted by ::genre) in the selected group, including subgroups in the case of Ambient/Dark Ambient.
It's worth pointing out that MusicBee also allows for custom defined tags - I'm not sure if Astra allows this but it's worth pointing out. Someone has used this to make a template for filtering by country.
Describe alternatives you've considered
Quod Libet allowed filtering using queries, and I wrote an app that converted groups in MusicBee tag hierarchy templates to queries, however large queries simply crashed the app. Tauon Music Box had "generators" but I was not able to get along with it.
Additional context
Someone had tried to do a PR on my template converting it to JSON. This may help if a relationship-based model would be preferred to a hierarchical model.