Great idea, Mark.
Let me supply some more videos:
Volare (not-so-serious Karaoke version)
Singing in the Rain The Ugly Duckling When the Saints Go Marching In in a legendary, funny version featuring Louis Armstrong and Danny Kaye (from: Five Pennies)
What a Wonderful World featuring Terry Fator and his impersonating turtle
Who Wants to Be a Millionaire? City Hall by Vienna Teng
Better Version of You - probably the only song to wake up a child...
For those with computer troubles:
The Gates by DaVinci's Notebook (I refrain from posting their greatest hit because it's definitely not appropriate though hilarious)
The ultimate template of a lovesong:
Title of the Song by DaVinci's Notebook
Not really "happy go lucky" but it always moves and inspires me:
Nkosi Sikeleli Afrika Hope there's something in there for everybody...
take care,
Wolfgang.