The mop-topped fab four from Liverpool conquered the world with catchy, feel-good hits like this song “I Feel Fine” from 1964. In the video, you can catch the Beatles' sense of humor, with George pretending to sing the wrong words and Ringo riding a bicycle instead of playing the drums.

The production of the song "Now and Then" took place over five decades and is the product of conversations and collaborations between the four Beatles that go on to this day. The long mythologized John Lennon demo was first worked on in February 1995 by Paul, George and Ringo as part of The Beatles Anthology project but it remained unfinished, partly because of the impossible technological challenges involved in working with the vocals John had recorded on tape in the 1970s.

Leonard daydreams about saving Penny and her falling for him.

While Sheldon struggles with his take-out order, Leonard bids on what he thinks is a miniature time machine.

Penny tries to patch things up between Leonard and Sheldon when they are having a fight, but ends up making things worse!

Howard takes a moment in the tub to fantasize that Katee Sackhoff from Battlestar Galactica is in the tub with him. As it turns out, she has some advice for him.

Penny invents a quiz to find out whether Sheldon or Leonard is smarter, which only reveals that both of them are completely uninformed about popular culture with the exception of Star Trek.

In this short scene, a deeply star-struck Sheldon meets one of his heroes, the great actor James Earl Jones, whom Sheldon knows as the voice of Darth Vader in the Star Wars movies.

The Black Eyed Peas originally are from Los Angeles. The video for "Just Can't Get Enough" from their sixth studio album was shot in Japan.

Enjoy The Cars singing their biggest international hit:Drive. A favorite at Yabla’s!

Enjoy this hit full of joie de vivre by this dynamic American rock band:The Cars!

Take a look at this clip of The Cars in action, performing parts of the hits “Good Times Roll”, “Just What I Needed” and “You Might Think”. You’ll see them on stage, back stage and also in their 1984 video release of “Heartbreak City.”

The song "Don't let me down" featuring Daya is from the album Collage by electronic duo The Chainsmokers. She sings about her fear of being let down at the wrong moment by the person she needs the most.

Enjoy this trailer for the film “The Chronicles of Narnia: The Voyage of the Dawn Treader.”

"London Calling" is a single from The Clash's third album. The album was a top ten hit in the United Kingdom and the single reached top twenty. "London Calling" was certified platinum in the United States.