Some of the biggest stars in music have joined forces for BBC Music's all-star cover of the Beach Boys' God Only Knows – watch it here.
The song features, from across the musical genres: Elton John, One Direction, Stevie Wonder, Pharrell Williams, Jake Bugg, Lorde, Emeli Sandé, Chris Martin, Kylie Minogue, Paloma Faith, Sam Smith, Florence Welch, Chrissie Hynde, Brian May, Dave Grohl, Alison Balsom, Martin James Bartlett, Danielle de Niese, Nicola Benedetti, Eliza Carthy, Baaba Maal, Jamie Cullum, Jaz Dhami and the BBC's Zane Lowe, Lauren Laverne, Katie Derham, Gareth Malone and Jools Holland with the Tees Valley Youth Choir and the BBC Concert Orchestra.
The cover marks the launch of BBC Music, described by the broadcaster as "an ambitious wave of new programmes, innovative partnerships and ground-breaking music initiatives that amount to the BBC's strongest commitment to music in 30 years".
The single is also available as a download in aid of BBC Children in Need.
Bob Shennan, Director BBC Music, said: "This is an exciting moment for BBC Music as we launch to a global audience. With the 80-piece BBC Concert Orchestra at its heart and comprising an array of iconic music stars, from a wide range of musical genres, this 'impossible' orchestra is a celebration of all the talent, diversity and musical passion found every single day throughout the BBC."
The writer of the song, music legend Brian Wilson, said: "I just feel so incredibly humbled that the BBC would choose God Only Knows to promote their new music initiative."