serenade

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A musical performance given to honor or express love for someone, often by one person.
• noun An instrumental composition written for a small ensemble and having characteristics of the suite and the sonata.
• intransitive verb To perform a serenade for.
• intransitive verb To perform a serenade.

from The Century Dictionary.

• noun In music, an evening song; especially, such a song sung by a lover at the window of his lady.
• noun An instrumental piece resembling such a song; a nocturne.
• noun Same as serenata.
• To entertain with a serenade or nocturnal music.
• To perform serenades or nocturnal music.

from the GNU version of the Collaborative International Dictionary of English.

• noun Music sung or performed in the open air at nights; -- usually applied to musical entertainments given in the open air at night, especially by gentlemen, in a spirit of gallantry, under the windows of ladies.
• noun A piece of music suitable to be performed at such times.
• intransitive verb To perform a serenade.
• transitive verb To entertain with a serenade.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a love song, especially one performed below the window of a loved one in the evening
• noun music an instrumental composition in several movements
• verb to sing or play a serenade (for someone)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a song characteristically played outside the house of a woman
• verb sing and play for somebody
• noun a musical composition in several movements; has no fixed form