The pure music "DangDangDang" in "Naruto" is a very rhythmic ninja theme music. The following are several ways to find this music:

1. Online music platforms: You can search for "Naruto Pure Music" on major online music platforms, and a lot of related music will appear, including "DangDangDang". You can choose a platform you like to listen to this music.

2. Official music album: Naruto official often releases music albums, which contain a large number of ninja-themed music. This music can be obtained by purchasing these albums.

3. Ninja-themed music collection: In addition to official albums, there are also many ninja-themed music collections released. This music can be obtained by purchasing these collections.

4. Online video platforms: On major online video platforms, there are many Naruto videos that contain this music. This music can be found by searching for related videos.

In short, there are many ways to find this music, including online music platforms, official music albums, ninja-themed music collections, and online video platforms.