Search: living in a dream jeep commercial
Why: I just saw it. The voice kind of sounds like Sheryl Crow, but I know it's not her.
Answer: "In a Tree" by Pricilla Ahn! Listen to the rest of the song here:
The More You Know: Here are the lyrics to the part in the commersh:
Living in a tree
Yeah, that's where I want to be
When the world falls down.
No one can say nothing
Which I guess means they'll say something
But I won't be around.
I'll be in my tree
As any child would wanna be