HomePod mini playing unknown music

We just got a HomePod mini and we're still figuring it out. My daughter tapped the top and it started playing a song we had never heard of before. I don't use any music streaming services and it isn't in my music library on my iPhone, my iPad, or my iMac, so where is it coming from? Is there a way to tell what source the HomePod is streaming from? I tried asking Siri and she just told us the name of the song. (Weight in Gold by Gallant, fwiw) I guess my main concerns are A) someone else is accessing my HomePod, or B) I've been signed up for a music streaming service without my knowledge.