Morrie's Auto Commercial driving me NUTS!

So, i don't know if this commercial is played nationwide or just in my area, but it'a a commercial for Morrie's Auto and it has this song in the background; it's a sort of whistling tune with just one person whistling at first and then someone else coming in to harmonize. Then, someone starts singing, but it's just kind of a "Oooh" thing...it sounds kind of like it would be from the 50s, also i think there might be a ukelele playing. Jeez, it's driving me crazy trying to figure it out. Sorry i'm being so vague, i'm not too good at descriptions.

You can try this, it's a very well-known whistling song:

http://www.youtube.com/watch?v=d-diB65scQU

So much! I feel a little dumb for not knowing it, but i am just glad i know what it is now. You're a lifesaver.