At the Sign of the Prancing Pony

This song highlights the town of Bree. It begins with the Hobbits' entry into the city and then the Prancing Pony Inn. Then, the Black Riders enter the city forcefully and with great malice. With their horses going rabid in the streets and the faceless riders upon them, none dare to approach or confront them. The Hobbits manager to hide and escape being seen for the time being with the help of Strider. Since Frodo accidentally put on the Ring at the Inn, the Riders are drawn quickly to the Inn but when he takes it off the Riders cannot locate him.

The Riders sense the Ring when it is worn, and are drawn quickly to the power it radiates. However, they are bound to Sauron's will and it is not possible for  them to disobey him.  They would simply get the Ring to bring back to Sauron. Therefore, they make perfect servants who are attempting to retrieve the Ring at all costs.