i couldnt possibly choose a single song, but here's a selection
sweetest feeling - Jackie Wilson (song we played when husband and I left the church at our wedding, everyone got up and danced, it was ace)
http://www.youtube.com/watch?v=eDB85BBV1uA
Say No Go by Hall and Oates - Daryl Hall held my hand when i was 10.
http://www.youtube.com/watch?v=6buJGU7wiBg
Uptown Top Rankin - wind up ya waist
http://www.youtube.com/watch?v=OMrNDnU6PPk&feature=fvw
New Order Bizzare Love Triangle (such a huge part of my youth - when i eventually saw them live in 1998 i burst into tears)
http://www.youtube.com/watch?v=fOWBX_xP5y8
Michael Jackson: Billy Jean and the whole of Off The Wall.
oo and Son of a Preacher Man - sexiest song ever.
Actually, i could go on all day so id better stop now.