Hey,
I thought the the head with the waves coming off it meant that someone was listening to your track but, it seems that they never change. Unless people are letting the same tracks of mine play over and over day after day which I highly doubt. What do theses icons mean?
@seangorman I think it’s an icon to represent that vocals are used in the track. 
I love your idea though - that would be cool to see if someone was listening to your track in real time. 
that makes sense .
thanks