X Ambassadors
Songs: Unsteady - Renegades - Blinding Lights - Happy People (& Teddy Swims & Jac Ross) - Sucker for Pain

X Factor
Joe McElderry, Leon Jackson, Same Difference, The X Factor Finalists, Alexandra Burke, Steve Brookstein, Shayne Ward, Leona Lewis, Susan Boyle, Jedward, Maria Lawson & Cher Lloyd
Songs: Hallelujah (Alexandra Burke) - A Moment Like This (Leona Lewis) - The Climb (Joe McElderry) - Somewhere Over The Rainbow (Shayne Ward) - You'll Never Walk Alone (Ray Quinn)

Xanadu (film)
Soundtrack (1980)
Siehe auch: Xanadu (musical), Olivia Newton-John, Cliff Richard & Electric Light Orchestra
Songs: Xanadu (Olivia Newton-John & Electric Light Orchestra) - Suddenly (Olivia Newton-John & Cliff Richard) - All Over the World (Electric Light Orchestra) - Don't Walk Away (Electric Light Orchestra) - Magic (Olivia Newton-John)

Charli XCX
Charlotte Aitchison
Songs: I Love It (& Icona Pop) - party 4 u - Guess (feat. Billie Eilish) - Yuck - Boom Clap (The Fault In Our Stars)

XTC
Songs: Senses Working Overtime - Dear God - Making Plans for Nigel - Mayor of Simpleton

XXXTentacion
Songs: Moonlight - Again (& Noah Cyrus) - Hope - Look at Me! - Falling Down (& Lil Peep)