ENGINE RINGING

[BMGYaris]

hey, i am a little concerned about something that i have noticed recently, though i dont know when it started. When i am going under 40 mph i dont hear anything, but when i hit 40 i hear a slight ring, but im not sure it is actually there...kind of playing tricks on me.

Then as i hit 50mph i am sure, there is def a ring, its just faint, 60 and its very clear, then 70mph and is pretty much squeeling--or more so a high pitch very audible chime ringing continuously, and if i am going 70-80 or any other speed and let my foot off the gas it goes away instantly. I dont think thats normal but if it is let me know...

so I guess i have to bring her back in to the dealer, but any ideas what it is so i can have some knowledge before i take it back to those jerks down here in south carolina?