Christina Perri performs her cover of "Have Yourself A Merry Little Christmas" in an exclusive recording session live at The Fortress in Los Angeles, CA for The Live Room on The Warner Sound.

Leonard daydreams about saving Penny and her falling for him.

In a passionate monologue, Linus explains what Christmas is really all about.

The big day arrives and the gymnastics finals begin. Robin is a ball of nerves, but Tommy is there to support her.

This video will teach you the different pronunciations of the word "the" in American English and when they are used.

The song "Firework" from singer Katy Perry's third studio album sold over 7 million copies in the United States. The music video was filmed in Budapest and was nominated one of the top 50 videos of the year.

The kids try to catch snowflakes on their tongues, and Linus once again proves to be wise beyond his years.

With "What Do You Mean?" Justin Bieber became the youngest male pop star in music history to debut at number one on the Billboard Hot 100 chart.

John Lennon's last live performance, filmed at the "Salute to Lew Grade" on April 18, 1975.

Shakira, singer and UNICEF Goodwill Ambassador, performs at the opening ceremony of the Sustainable Development Goals Summit at the General Assembly of the United Nations, 70th session.

The meet takes an unexpected turn and Leah is more smug than ever, but Robin gets some extra encouragement from her friends.

"Every Breath You Take" is a song recorded by the London-based band the Police. It was written by Sting and was nominated that year for several Grammy awards. Enjoy!