It depends on who you mean. The only singer who i know who sings La La Land is Demi Lovato.
Demi Lovato.
Iggy Pop sings "The Passenger"
A girl named Auburn, sings La, La, La.
A Greek girl called Ivi Adamou sings a song called la la love.
The Pixies.
Auburn
its by auburn
yael- new soul
Ashlee Simpson
alex vandroodey
Akon?
Ohh La La by GoldFrapp