New Champ Teaser

So I got into a game last night and I was playing Ivern and there was a different tune playing that I have NEVER heard, it was just Ivern humming either like there was different music playing for the first like a minute and a half into the game and then it faded out. So I am wondering if this si maybe a new champ teaser? Probably not but I can be wishful! It was a very smooth and gentle type of melody! Something that would come from Sona, but there wasn't a Sona in the game. I wish I could've recorded it!