* J-Pop Paradise. This website offers a large collection of J-rock and J-pop songs for free download. You can browse by artist, genre, or popularity, and you can also create your own playlists.
* Nipponsei. This website offers a smaller selection of J-rock and J-pop songs for free download, but it also offers a variety of other Japanese music genres, such as traditional music, enka, and kayokyoku.
* J-Pop Station. This website offers a mix of free and paid J-rock and J-pop songs for download. You can browse by artist, genre, or popularity, and you can also create your own playlists.
* TokyoSounds. This website offers a variety of Japanese music, including J-rock, J-pop, and classical music. You can browse by artist, genre, or popularity, and you can also create your own playlists.
In addition to these websites, you can also find free J-rock and J-pop music on streaming services such as Spotify, Apple Music, and Pandora. You can also purchase J-rock and J-pop music on iTunes and Amazon Music.