Who's in the Impossible Orchestra?

Watch the full God Only Knows (BBC Music) video

And in order of appearance...

16 year-old pianist Martin James Bartlett has twice been a finalist in the BBC Young Musician of the Year contest, and he won this year’s competition with his remarkable keyboard talents.

Performer and producer extraordinaire Pharrell Williams gave an in-depth interview to Radio 1’s Zane Lowe earlier in 2014 and also headlined the station’s Big Weekend in Glasgow this May.

Emeli Sandé is perhaps best known for her performances before a global audience at the London Olympic Games in 2012. At the BBC Radio 1 Academy in Glasgow 2014, she shared her songwriting tips with aspiring artists.

In 2013 the inimitable Elton John treated us to a one-hour live special as part of BBC Radio 2's In Concert series, performing classic hits from his remarkable back catalogue.

Teenage New Zealand sensation Lorde made her UK TV debut on BBC Two’s Later… with Jools Holland in autumn 2013 and went on to give a show-stopping performance at Radio 1’s Big Weekend this year.

Chris Martin’s band Coldplay gave an incredible headline performance at Radio 1’s Big Weekend 2014 in Glasgow and headlined BBC’s Glastonbury coverage three times - in 2002, 2005 and 2011.

The Beach Boys’ songwriter Brian Wilson delighted the Glastonbury crowds in 2005 with a sun-drenched setlist of the California band's greatest hits, and more recently joined Jools Holland to perform God Only Knows live in the studio.

Florence Welch (of Florence + The Machine fame) was proudly supported by the BBC from her beginnings as a BBC Introducing artist through to huge performances at Radio 1's Hackney Weekend, T In The Park and Reading Festival.

Kylie’s recent BBC performances include Radio 2 In Concert earlier in 2014 and a headline appearance at 2012’s Proms In The Park, plus of course her role as a judge for the last season of The Voice UK.

The legendary Stevie Wonder thrilled Glastonbury with his headline set in 2010 and gave another memorable performance live on the BBC when he was on the line-up for the Queen’s Diamond Jubilee concert in 2012.

English folk musician Eliza Carthy joined her father, the acclaimed Martin Carthy, live at the Radio 2 Folk Music Awards 2014, and has performed in session at BBC's Maida Vale studios.

Scottish violinist Nicola Benedetti gave a high profile BBC One performance as part of the opening ceremony to the 2014 Commonwealth Games in Glasgow and chose her Desert Island Discs on Radio 4 earlier this year.

Host of the legendary Later… with Jools Holland - BBC TWO’s flagship music show - and a renowned musician and composer in his own right, Jools has hosted, performed and collaborated with some of the biggest names in music from across the globe.

Queen guitarist Brian May’s most memorable BBC performance was probably his rendition of the national anthem, God Save The Queen, on the roof of Buckingham Palace as part of the Queen’s Golden Jubilee celebrations in 2002.

Nottingham's Jake Bugg rose steadily through the ranks from BBC Introducing to a headline performance at Glastonbury and a running total of three Reading + Leeds appearances.

Katie Derham has fronted coverage of the Proms for BBC Two since 2010, and is a presenter on BBC Radio 3’s Afternoon on 3 and Breakfast programmes. In 2008 she could be seen learning to be a conductor in BBC Two’s reality show Maestro.

Lauren Laverne first made her name as frontwoman of indie-pop band Kenickie before becoming one of the UK’s most recognisable figures in broadcasting. She hosts 6 Music's Live at Maida Vale concerts – whose performers have included Johnny Marr, Paul McCartney and Primal Scream.

Choirmaster Gareth Malone was the star of BBC Two's The Choir. His mission? To teach choral music to absolute newcomers. He recently united an All-Star Choir for the official BBC Children In Need 2014 single.

Classical trumpeter Alison Balsom is a former Radio 3 New Generation Artist and has made several appearances at the BBC Proms, including Last Night of the Proms in 2009 with the BBC Symphony Orchestra.

Arguably the biggest boy band the world has ever seen, One Direction created a huge stir when they opened Radio 1's Big Weekend 2014 in Glasgow.

DJ Zane Lowe is at the forefront of the new music scene, playing a new Hottest Record In The World daily on his Radio 1 show and interviewing artists like JAY Z, Kanye West, Chris Martin and Eminem.

Birmingham bhangra star Jaz Dhami, named Best Newcomer at the 2009 UK Asian Music Awards, performed live as part of BBC Asian Network’s Summer Of Melas 2013.

Paloma Faith gave two very different performances for the BBC this summer: a classical collaboration at the Royal Albert Hall as part of BBC Proms 2014, followed by a pop concert at Radio 2 Live in Hyde Park.

Pretenders frontwoman Chrissie Hynde performed with the Pet Shop Boys at BBC Proms 2014, backed by the BBC Concert Orchestra. Later in the year she joined the line-up at BBC Radio 2 Live in Hyde Park.

Singer-songwriter Jamie Cullum has been a part of the BBC Radio 2 family with his own weekly show since April 2010 and performed at the BBC Proms in 2010.

Singer and guitarist Baaba Maal is one of Africa’s best known musicians. He's performed five times on BBC Two’s Later… with Jools Holland, stretching back to episode 3 in 1992!

One of the biggest names in the opera world, soprano Danielle de Niese sang live in the studio for BBC Radio 3’s In Tune earlier this year and was one of the presenters of the 2014 BBC Proms.

Dave Grohl and his band Foo Fighters headlined Radio 1’s Big Weekend when it visited Cumbria in 2011. His former band Nirvana played three now legendary sessions for John Peel between 1989 and 1991.

Sam Smith won the BBC's Sound Of 2014 poll back in January. He's since wowed us with stunning performances in Radio 1’s Live Lounge and at Radio 1's Big Weekend in May, where he found out he was No.1 in the UK’s Official Chart - live on stage!