Pandora

Go to Pandora and enter the Sanford & Son theme song as a new "station". You'll be rewarded with a seemingly infinite supply of music to which it is impossible to be in a bad mood.

For that matter it will be nearly impossible to not find yourself doing the White Man Overbite dance. YOU HAVE BEEN WARNED

(Also it turns out if you listen to a lot of tango music, you start getting ads in Spanish)