At an intimate open-air concert, Jack Johnson sings about the simple things in life that fascinate us.

The British synth-pop band Tears for Fears released the song "Mad World" on their debut LP "The Hurting." At the time, they had little idea that it would become a hit single.

Eminem performs "Stan," a song written from the perspective of a fan, live at the BBC's Maida Vale studios for Radio 1.

Crash Test Dummies, a Canadian folk-rock band, perform their song “Mmm Mmm Mmm Mmm.” The song was featured on their second album, God Shuffled His Feet

English ghetto pop artist and songwriter Jessie J performs her 2010 hit Do It Like A Dude .

Katie Melua accompanies herself on the guitar in a performance of "Fields of Gold", a simple, nostalgic song made famous by Sting, who wrote it and originally recorded it.

"Lonely Together" is a song by Swedish DJ Avicii, featuring British singer Rita Ora. The song is about heartbreak, facing the facts, but also an attempt to feel better through companionship, feeling a bit less lonely.

Listen to U2's “You're the Best Thing about Me.” Rolling Stone magazine defines the song as “a joyous ear-worm about romantic dissatisfaction.” The video is set in New York City. The opening and closing lines of the video come from “The New Colossus” by Emma Lazarus, a sonnet written to raise funds for the Statue of Liberty's pedestal.

Sometimes all you need is a flashlight to find your way in the dark. That's how Jessie J feels about her boyfriend.

The title "Rockabye" is taken from the famous nursery-rhyme lullaby "Rock-a-bye baby on the tree top." The song is an electronic pop lullaby, and touches on the hardships of single mothers trying to bring up their babies right. It is sung by Anne-Marie in the role of the mother comforting her baby, and by Sean Paul who gives his support, singing in Jamaican English, so be on the lookout for unconventional grammar in the lines he sings.

Bruno Mars talks about his musical background and his collaboration with Philip Lawrence. They started working together in Los Angeles and their collaboration has led to numerous recordings, concerts, and awards. Both artists are Grammy-winners. Music critic Sarah Rodman wrote that Bruno Mars has an “indefatigable ecstatic approach to performing.”

Barbadian singer Rihanna is one of the best-selling artists of all time. Here, she performs "Stay," an intimate, melancholy piano ballad from her seventh album Unapologetic. It also features Mikky Ekko on the vocals.

The Pogues' alternative Christmas song is not about snowflakes, mistletoe or angels, but broken promises and ruined dreams, as well as time spent in the drunk tank. There have always been lots of policemen in New York City with Irish ancestry, hence the connection with the NYPD (New York Police Department).

Katie Melua lends her characteristic style to this gentle rendition of a well-known and loved Christmas song "O Holy Night". Melua accompanies herself on an acoustic guitar, and background vocals are provided by a choir.

The band Bastille performs their version of the popular Christmas carol "O Holy Night." They have modified and modernized the lyrics, especially in the second verse, to be more earthly, rather than heavenly, and more pessimistic than optimistic. Dan Smith is the lead vocalist of the UK band. His birthday is on July 14th, Bastille Day, hence the name of the band.