A good option is the official phonetics section on youtube. There is really enough music here, but there is a problem, it is not convenient to download music from court, you have to download music one by one. We are all lazy, and do not want to spend time downloading music. But there are services where you can find royalty free music and where you can download music in one click in a couple of seconds. The cost of the subscription will depend on the tariff you choose.