"Waiting for Tonight" est une chanson de dance-pop, une combinaison de disco, pop des années 1980, R & B des années 1990 et musique de club. Les paroles sont sensuelles, Lopez comparant sa vie sexuelle à une scène de film.
"Waiting for Tonight" est considéré comme la meilleure chanson de la carrière de Lopez en faisant d'elle un artiste principal dans le genre de musique latine, fréquemment utilisé comme un hymne de fête en prévision de l’aube du nouveau millénaire. Le single a connu un succès commercial, atteignant les dix premiers en Australie, Belgique, Canada, Finlande, France, Grèce, Hongrie, Italie, Pays-Bas, Nouvelle-Zélande, Espagne, Royaume-Uni et aux États-Unis.

Like a movie scene,
In the sweetest dreams,
I have pictured us together
Now to fell your lips,
On my finger tips,
I have to say is even better
Than I ever thought it could possibly be
It's perfect, it's passion, its setting me free
From all of my sadness,
The tears that I've cried, I have spent all my life

Waiting for tonight, Oh
When you would be here in my arms
Waiting for tonight, Oh
I've dreamed of this love for so long
Waiting for tonight
Tender words you say,
Take my breath away,
Love me now, and leave me never

Found a sacred place, lost in your embrace,
I want to stay in this forever
I think of the days when the sun used to set,
On my empty heart,
All alone in my bed
Tossing and turning emotions were strong, I knew I had to hold on

Waiting for tonight, Oh
When you would be here in my arms
Waiting for tonight, Oh
I've dreamed of this love for so long
Waiting for tonight, Oh
When you would be here in my arms
Waiting for tonight, Oh
I've dreamed of this love for so long
Waiting for tonight
Gone are the days when the sun used to set,
On my empty heart all alone in my bed
Tossing and turning,
Emotions were strong
I knew I had to hold on
Waiting for tonight, Oh