There are two big issues with quoted catalog sizes.
#1 - Catalog sizes are inflated for international services
Services in multiple countries have larger catalogs because they include content in local languages. This means much of the catalog is there, but less useful for you (unless, of course, you're into German polkas or Swedish midsummer dances). XBox and Spotify do tally all of these up to arrive at their totals.
#2 - The full catalog in international services isn't usually available to you
At least on Spotify, you cannot access all of the items in the catalog of another country (e.g. with a US account, you cannot access all of the Dutch catalog, I tried). I'm assuming this is also the case for XBox. They list the total, but access is limited by billing address or geo location.
In that context I suggest that you and everyone else checks out the mother of all streaming services, Rhapsody (18MM songs, US only, i.e. these are actually 18MM songs available to you). I've tried the others, but time and again I found Rhapsody's catalog to be somehow bigger, more older albums, more classical music, etc.
Note: I've been a Rh member since 2004 (longer if you count listen.com). Use it on my Android, iOS, Desktop and Sonos. Haven't bought a CD since I joined (except Dutch ones, of course)
#1 - Catalog sizes are inflated for international services
Services in multiple countries have larger catalogs because they include content in local languages. This means much of the catalog is there, but less useful for you (unless, of course, you're into German polkas or Swedish midsummer dances). XBox and Spotify do tally all of these up to arrive at their totals.
#2 - The full catalog in international services isn't usually available to you
At least on Spotify, you cannot access all of the items in the catalog of another country (e.g. with a US account, you cannot access all of the Dutch catalog, I tried). I'm assuming this is also the case for XBox. They list the total, but access is limited by billing address or geo location.
In that context I suggest that you and everyone else checks out the mother of all streaming services, Rhapsody (18MM songs, US only, i.e. these are actually 18MM songs available to you). I've tried the others, but time and again I found Rhapsody's catalog to be somehow bigger, more older albums, more classical music, etc.
Note: I've been a Rh member since 2004 (longer if you count listen.com). Use it on my Android, iOS, Desktop and Sonos. Haven't bought a CD since I joined (except Dutch ones, of course)