Quién será? est un boléro-mambo écrit par le compositeur mexicain Luis Demetrio, La version anglaise, "Sway", avec les paroles de Norman Gimbel, est devenue une référence dans le répertoire pop et jazz. La première version à avoir connu un succès considérable aux États-Unis a été enregistrée par le chanteur Dean Martin avec l'orchestre Dick Stabile en 1954.

When marimba rhythms start to play
Dance with me, make me sway
Like a lazy ocean hugs the shore
Hold me close, sway me more

Like a flower bending in the breeze
Bend with me, sway with ease
When we dance you have a way with me
Stay with me, sway with me

Other dancers may be on the floor
Dear, but my eyes will see only you
Only you have the magic technique
When we sway I go weak

I can hear the sounds of violins
Long before it begins
Make me thrill as only you know how
Sway me smooth, sway me now

Other dancers may be on the floor
Dear, but my eyes will see only you
Only you have the magic technique
When we sway I go weak

I can hear the sounds of violins
Long before it begins
Make me thrill as only you know how
Sway me smooth, sway me now
You know how
Sway me smooth, sway me now