As Coldplay's popularity grew, so did their musical ambitions. With "X&Y" (2005), the band began to experiment with new sounds and textures, incorporating electronic elements and distorted guitars into their music. The album's lead single, "Speed of Sound," was a prime example of this new direction, featuring a driving beat and a memorable hook. However, it was their fourth album, "Viva la Vida or Death and All His Friends" (2008), that truly marked a turning point in the band's career.