The document summarizes the lighting techniques used in three different music videos. Katy Perry's "California Girls" uses warm, vibrant colors to portray a happy message for its teenage audience. Linkin Park's "Numb" employs darker lighting to match the feel of the song and show the girl's emotions of not fitting in. Birdy's "1901" features a mixture of natural and high-key lighting to create a calmer sense that represents the song and shows the artist's originality through the lighting.