? Whistling song ?

Hey everyone,
We went on a trip to Califorina early this year and a song played on the radio all the time. Did'nt think much of it, but learned my son got really attached to it. I was feeling bad that I did'nt have more info than I do until I read a few threads here, surely someone can help!
O k, it has words but all I remember is the whistling;

do do do do
do do do,.......do do do do
do do do do do!
do do

I don't think it's in the charts top 100, but i've been hearing in sit coms on tv (which of course don't credit it) and we heard it the other day at Sonic. help?

A popular "whistling" song is "Young Folks" by Peter Bjorn and John. This one??