"Smooth" a été initialement conçu par Shur comme une chanson appelée "Room 17". Les paroles ont été enlevées et le morceau a été donné à Thomas, qui a réécrit les paroles et la mélodie et l'a rebaptisé "Smooth", puis a enregistré la chanson en tant que démo pour jouer avec Santana. Après avoir entendu la chanson, Santana a décidé de faire enregistrer la version finale par Thomas. Matt Serletic (qui a produit le premier album de Matchbox Twenty, Yourself ou Someone Like You) a produit la chanson et il est sorti de l'album Supernatural de Santana. Thomas avait à l'origine pensé à George Michael pour chanter la chanson.
Thomas a écrit "Smooth" pour sa femme, Marisol Maldonado. Il a déclaré dans des interviews que la chanson "My Spanish Harlem Mona Lisa" était inspirée de la chanson de 1972 "Mona Lisas et Mad Hatters" d'Elton John

Man, it's a hot one
Like seven inches from the midday sun
Well, I hear you whispering in the words, to melt everyone
But you stay so cool
My muñequita, my Spanish Harlem, Mona Lisa
You're my reason for reason
The step in my groove
And if you said this life ain't good enough
I would give my world to lift you up
I could change my life to better suit your mood
Because you're so smooth
And it's just like the ocean under the moon
Oh, it's the same as the emotion that I get from you
You got the kind of lovin' that can be so smooth, yeah
Give me your heart, make it real or else forget about it
But I'll tell you one thing
If you would leave it would be a crying shame
In every breath and every word
I hear your name calling me out
Out from the barrio
You hear my rhythm on your radio
You feel the turning of the world, so soft and slow
It's turning you round and round
And if you said this life ain't good enough
I would give my world to lift you up
I could change my life to better suit your mood
Because you're so smooth
And it's just like the ocean under the moon
Oh, it's the same as the emotion that I get from you
You got the kind of lovin' that can be so smooth, yeah
Give me your heart, make it real or else forget about it
And it's just like the ocean under the moon
Oh, it's the same as the emotion that I get from you
You got the kind of lovin' that can be so smooth, yeah
Give me your heart, make it real or else forget about it
Or else forget about it
Or else forget about it
Let's not forget about it
Give me your heart, make it real
Let's not forget about it
Let's not forget about it