Soundbounce is a free browser add-on that allows you to listen to Spotify in sync with users around the world. Developed by soundbounce.org, this program utilizes Spotify's web player to play audio from rooms in Soundbounce.

With Soundbounce, you can join rooms and listen to music together with friends or strangers, creating a unique social listening experience. The program ensures that all users in the room are synced, so you can enjoy the same songs at the same time.

Soundbounce is easy to use and seamlessly integrates with Spotify's web player. Simply install the add-on in your browser and start joining rooms to listen to music with others. The program also provides features such as starring songs and opening tracks directly in Spotify for a more personalized experience.