The design team at Microsoft which is responsible for sounds, ringtones, etc, in the Nokia Lumia devices has today shared their 2015 sound collection on SoundCloud which you can download. You can listen to them above.
Our latest ringtone set introduced in Lumia 830 and 735. This is the variant for Europe and North America. The Cat ringtone is now Two Cats! 🙂
They are regularly updating the page with various sounds, such as old and new ringtones, the latest Core Brand Sounds (Nokia Tune etc.), sound design done for events, and music tracks used in advertising. Check out their SoundCloud profile page here.