Android Auto - What info is displayed?

[mbarrucci]

When I have a song playing in Android Auto it displays
"Song Title"
unknown - says unknown
"Artist"

Does anyone know what info the unknown line should be?

[Lowlander]

Is Album known?

[mbarrucci]

Album title is known. Android Auto doesn't show Album title for some reason. But it shows whatever this field is that is unknown. Hoping that if someone knew what tag this was that I may be able to put album title into the tag.