It is sort of upbeat, and is used to show happiness (unless it is sarcastic).
Also, it is used to represent tunes in a song (i.e. la----lala, lala.) when put with some others. They use it because they can't really use anything else - music tunes are a little indescribable when explained about on the internet.
Also, some people find it a little...natural nowadays.
La femme. But if you wanna say it with more respect you can say La dame or La madame
to symbolize singing
You would say, "de la familia".
You would say "En la clase de español".
la la
My head my head
To say "the house of" in French, you would say "la maison de."
You would say "de la tarde" or "de la noche".
Anything, if you don't like them then say "La la la I'm a little stupid person" or something. if you like them say "Too hard"
You can say girl in Spain like la chica or la Nina or la muchacha. There are other ways as well.
Good-bye, you say LA REVEDERE [la'-rehvehdehra] which means "see you soon" Good-bye, you say PA [pah] which means "good bye for ever"
You first say LA LA LA LA LA LA LA LA LA LA LA LA LA LA LA LA LA LA LA LA LA!