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.

"What Christmas Means to Me" was written by Allen Story, Anna Gordy Gaye, and George Gordy. It has been recorded by many artists, and here is a very catchy version performed by Cee Lo Green on his album Cee Lo's Magic Moment.

Harry Edward Styles is a young English singer, songwriter, and actor. He rose to stardom as a member of the boy band "One Direction." "Kiwi" is a particularly personal and explicit song, possibly about an ex-girlfriend, who might have been from New Zealand, since "Kiwi" is slang for "New Zealander."

Katie Melua sings "Where Does the Ocean Go?" It is a single from Ketevan, her sixth studio album. In the video, as she sings, a painter-seaman paints the ocean. The song was inspired by Samuel Taylor Coleridge’s The Rime of the Ancient Mariner.

Here is a live performance of American singer songwriter Jack Johnson singing his hit song "Taylor". Enjoy!

Esperanza Spalding, the first jazz musician to ever win a Grammy award, covers Lauryn Hill's song “Tell Him.” The song is loosely inspired by the famous Bible passage about "faith, hope, and love" from First Corinthians chapter 13.

Why, sung by Sabrina Carpenter in an "electropop" style, is all about contrasts. A conversation in a restaurant between Sabrina and her boyfriend sets the stage for a song about all their differences and how, for some mysterious reason, they still get along fine.

Georgian/British singer-songwriter Katie Melua performs "Forgetting All My Troubles" from her album Secret Symphony.

Australian-born singer-songwriter Stu Larsen made a decision to leave behind normality, security and comfort, choosing to live as simply as possible and to follow the opportunities that lay themselves down in front of him. He has no home. He sings this foot-tapping country song based very loosely on the story of Bonnie and Clyde.

Ed Sheeran wrote this uplifting African-inspired song about hope with Fuse ODG in Ghana. The song's title and refrain, Bibia be ye ye, is in Twi, a language spoken in Ghana and translates to "Everything will be all right." Shot by Ghanaian director, Gyo Gyimah, the video focuses on Ghana's rich culture – from the food to the people – following different Ghanaians as they lip sync and dance to the infectious song.

British artists Rita Ora and Ed Sheeran sing "Your Song", which they co-wrote. This is their first collaboration, but they've been friends since they were teenagers.