It is (was?) almost impossible to find Japanese music online in legitimate ways. What I means, search for almost any western song and it will be on youtube either by the band itself, their publisher, or VEVO. Search for nearly any Japanese song and you won't find them on youtube, at least not officially. You might find a music video but it will often be edited in the middle with some interruption to basically make it not what you actually want (the full song).
I don't know why this is. I assume the Japanese music industry believes they'll make no money if the full music videos are available online. (note: this might be changing but it was true for many songs a year ago).
Example: The theme to Demon Slayer: LiSA - Gurenge (紅蓮華), searching brings up "officially" a short edited version, a practice version, and a live version but not the hit full song version.
Another example: Spice by Tokyo Karankoron the official music video cuts out after 1:30 and effectively says "buy it"
For whatever reason that's very different than the west.
Other random examples of differences:
* CD stores still exist in Japan (although they are clearly getting fewer in number)
* The Mini Disc was huge in 1997-2004ish. Normal models ran for > 200hrs on a single charge something no mp3 players I know of have ever come close to.