To connect Bluetooth music on an old BMW, follow these steps: 1. Start the car and make sure the ignition is on. Turn on the infotainment system if it\'s not already on. 2. On the infotainment screen, select the \"iDrive\" or \"Audio\" menu. You may need to use the touch screen or the controller to navigate to this menu. 3. Press the \"Phone\" or \"Media\" button on the controller. This will show you a list of available connections, including Bluetooth. 4. Select \"Bluetooth\" from the list. 5. The infotainment system will search for nearby Bluetooth devices. It may take a few seconds. 6. When it finds your device, it will show a list of available audio sources. Select the one you want to play music from, such as your phone or MP3 player. 7. To play music, simply tap or click on the song you want to play. Your music should start playing through the car\'s audio system. 8. If you want to skip between songs or adjust the volume, you can use the touch screen or the controller. 9. To disconnect the Bluetooth connection, simply go back to the \"Audio\" menu and select \"Off.\"