Official Sources:
* YouTube: Search for "Doctor Who Theme No Titles" or "Doctor Who Theme Instrumental." There are plenty of fan-made uploads that isolate the music.
* SoundCloud: Similar to YouTube, many users have uploaded the theme without the titles.
* Spotify: Look for playlists or albums specifically dedicated to Doctor Who music. You might find versions of the theme without the title sequence.
Other Options:
* Doctor Who Soundtracks: You can often find CDs or digital downloads of official soundtracks that include instrumental versions of the theme.
* Fan Websites: Dedicated Doctor Who fan websites might have downloadable sound files of the theme without the titles.
Note: It's important to be aware of copyright issues. Some uploads on platforms like YouTube may be unofficial and potentially infringe on copyright. If you want to use the music for any commercial or public use, it's best to contact the BBC directly for licensing information.