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.

Bryan Adams and The Who perform Behind Blue Eyes, one of The Who's most well-known songs, at The Royal Albert Hall, London, in aid of the Teenage Cancer Trust.

James Bay is an English singer-songwriter and guitarist. His single "Hold Back the River" is certified platinum and appears on his debut album "Chaos and the Calm."

Enjoy this excerpt of Led Zeppelin performing "Stairway to Heaven" at Earls Court. Written by guitarist Jimmy Page and vocalist Robert Plant, the song is widely acknowledged as one of the greatest rock songs of all time.

Justin Bieber headlined the 2015 Jingle Bell Ball in London, finishing his set with the song "Sorry."

"Sunday Bloody Sunday" is a song by the Irish rock band U2 that was written as a response to events related to conflict in Northern Ireland at the time. It is considered one of their signature songs, and is one of the band's most performed tracks.

Taylor Swift's incredible performance of her track "I Knew You Were Trouble" at Capital FM's Jingle Bell Ball!

The First Lady welcomes the first act in an evening of poetry, music and spoken word at the White House. Pianist ELEW and bassist/singer Esperanza Spalding kick off the evening with an instrumental jazz fusion performance. Enjoy!

Lifestyle video blogger Aspyn Ovard demonstrates how she packed her suitcase efficiently for a recent trip to the Bahamas.

Canadian sensation Shawn Mendes made his debut at age 16 with the album "Handwritten." Here he performs the hit single "Stitches" in a duet with US singer and actress Hailee Steinfeld.

As the story goes, the theater of the Montreux Casino caught fire during a Frank Zappa concert in 1971. Members of the British band Deep Purple were in attendance and later wrote this song about the event. "Smoke on the Water" is one of the most famous songs in rock and roll history, known for its memorable guitar riff. Enjoy commentary from keyboardist Jon Lord after the concert footage!

American adult animated sitcom "Family Guy" has been nominated for and won many awards. It continues to air new episodes, going on its fourteenth season.

MAGIC! is a Canadian reggae fusion band. Members Nasri, Ben Spivak, Mark Pellizzer, and Alex Tanas stopped by On Air with Ryan Seacrest to perform their hit song "Rude."

Robby, Kevin and Jesse have found a few great spots to kite along the west coast. Watch for some amazing scenery and kite-boarding skills.

This video for the Beatles' song "A Day in the Life" features footage of the recording sessions which resulted in the song's famous orchestral component, as well as cameos by the Beatles and some of their friends.