The first track which comes to mind is Tu Amor Me Hace Bien by Marc Anthony - which loosely means Your Love Is Good For Me... however, it’s quite a fast track for the first dance at a wedding.
A slower song by Marc Anthony is “Volando Entre Tus Brazos” (“Flying Between Your Arms”)
So it depends on what kind of a speed song you want. Both of the above tracks are very romantic...! You can find them both on the recommended Salsa Music section of our site here: www.salsaalocubano.co.uk/music.htm
There are of course loads of other songs and I will post some more later if I remember... though are you looking for a Salsa song in English or in Spanish?
Sabina