I've heard it multiple times in Starbucks.

Summary: It is a female singing the song over simple music at a slow to moderate tempo. Sounds "singer/songwriter."

Identifying features:

1) Some lyrics about asking a teacher something, possibly about what to be when one grows up.

2) A refrain that is not made up of words but, rather, one repeating sound, though I can't remember it.

Any help is appreciated.