Why: Another one addressing the social issues facing Jamaica. Marley wants to unify Jamaica and wants those in charge to help. An overused topic? Not when the gap between third and first world remains so apparent.
49. Kate Nash - Nicest Thing (2007)
Why: The song with the most truthful lyrics about unrequited love. Manages to personify hope, anger, annoyance , longing and sorrow in four minutes.
48. Franz Ferdinand - Take Me Out (2003)
Why: One of the most recognizable riffs of the decade; one you've probably sang along to. Simple sing-along lyrics help with the singing along style of this song.
47. Jimmy Eat World - The Middle (2002)
Why: The song that carried Jimmy Eat World to the mainstream. Lyrics that reflect going through troubled are about as emo as you get from Jimmy Eat World, but they keep it fun with a catchy hook and upbeat guitar.
46. Keane - A Bad Dream (2007)
Why: Based on a W.B. Yeats poem the song is a ethereal as you'd expect from the source inspiration. Starts out pretty slow and calm but develops into a loud expression of anger.Or as angry as you get from Keane anyway.
45. Kanye West ft. John Mayer - Bittersweet Poetry (2007)
Why: Lyrics that map the demise of a relationship but an on-again, off-again one. Manages to make the love-hate relationship seem so clear that even people who never had one can relate. Signals the start of Kanye going alt, whether that's good or bad remains debatable.
44. R.Kelly - Ignition (Remix) (2003)
Why: A casual unleashing of images that create the mood of a night about the town. This is the song that symbolizes 'the best night out' in the 00 decade.
43. Coldplay - A Message (2005)
Why: Another beautiful Coldplay song with ambiguous lyrics. Is it to a lover who's away? To an ex? A ballad of unrequited love? We'll never know but it's beautiful. Whatever the story behind it is.
42. Snow Patrol - An Olive Grove Facing the Sea (2009 Version)
Why: An entire orchestra gets involved in this one. Possibly the most haunting of Snow Patrol's songs (and haunting is their style) and maybe the one that's most fantasy inducing. It gets into your head, like very few songs will.
41. Bruce Springsteen - Devils & Dust (2005)
Why: Acoustic folk rock puts Bruce back to his 'Ghost of Tom Joad' best. Lyrics are about an American soldier who is struggling to find the point of his mission. Not your conventional anti-war song, the soldier wants to do what's right and take a righteous stand.