I have two... well really I have a million but I'll chose the ones I have hummed in my head over the most over the years...
Wully Bully - My dad used to say I danced to it in my high chair! It gained points with me when it was used in the Chipmunk adventure movie! And I still get excited when I hear it on the radio! It is just a fun song to dance to and act like a big goof
The Next To Be With You (By Mr. Big) - I have a low singing voice and this song is sooo perfect for my range that I just love to sing along! Plus I love the 80's and early 90's ballads!