the methods of downloading car music are as follows: 1. download music in USB flash drive, SD card and other devices through storage devices, and plug it into the corresponding interface on the car. 2, Bluetooth transmission, using mobile phones and other devices connected to the car audio can be played. 3, data cable connection, MP3, mobile phones and other car audio connection can be played. 4, direct download, some car stereos have their own storage space, which can be downloaded by mobile phones and transmitted. Compared with the traditional car system, Android car can connect to the Internet like a mobile phone, and download the required application software through the built-in app store.