SoundWorks Collection: The Music of La La Land with Composer Justin Hurwitz
Watch the wonderful video above from SoundWorks Collection about how the sound of La La Land was made by composer Justin Hurwitz.
On a related note, I just discovered on Spotify that La La Land has a 44-track extended soundtrack available called "La La Land - The Complete Musical Experience". It's much more fun to listen to than the standard soundtrack and you can hear the whole album below.