The Wheels on the Bus

is Augie's 'Happy Song'.  Singing it can get him out of any bad mood or distress 98.75% of the time.  For example...here he is heading into strife at 12.11pm today 

and here he is at 12.12 pm, after a couple of verses of The Wheels on the Bus

Fortunately, as far as tunes which must be sung ad nauseum go, it's only mildly annoying (not in the stratospherically annoying heights of Mary Had a Little Lamb) and there are an almost infinite number of verses which can be added.  Somedays we get almost an entire zoo on the bus before Augie forgets completely whatever was ailing him before the singing started.  

And when Dad sings The Wheels on the Bus, well, we get a whole different passenger makeup entirely!