But I remember the music too, and it makes me think of something else: "Oompa, loompa, doopity doo!" That's right: It sounds a lot like the Oompa Loompa song from Willy Wonka and the Chocolate Factory. Maybe they build them or something, and that's part of their union contract that they have to use their song in the ads, so they get royalties.
Here's an older Lexus "December to Remember" ad (I can't find the new ones yet, sorry. The tune I'm talking about starts at .11 seconds in.):