serenade
US /ˌser.əˈneɪd/
UK /ˌser.əˈneɪd/

1.
a piece of music sung or played in the open air, typically by a man to his beloved under her window in the evening.
:
•
He sang a beautiful serenade to his girlfriend.
•
The opera featured a romantic serenade scene.
1.
sing or play a serenade to (someone).
:
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He decided to serenade her under her balcony.
•
The mariachi band will serenade the guests.