What song does Ron Burgundy sing to express his love for Veronica in Anchorman?

Ron Burgundy doesn't sing a song to express his love for Veronica in Anchorman. He does, however, sing a very enthusiastic rendition of "Afternoon Delight" by Starland Vocal Band.

It's not exactly a love song, but it's a very passionate performance that shows Ron's feelings for Veronica in his own unique way.