Here's a list of some of the most beautiful voices I've ever heard.

My mom's.

Michael Barnes's of Red.

Tyler Joseph's of Twenty One Pilots.

Lacey Sturm's.  

Matt Theissen's of Relient K . 

Jeremy Dunn's (I looked it up, but I'm not quite sure) of Nine Lashes.

David Tennant's.

Benefit Cucumbersmash's. 

I think that's it. 

**Update**

Oh yeah, I had forgotten Adam Young's voice.