Sunshine In A Bag - The Search For The Decade's Best Songs

Still trying to think about my favourite song of the past ten years, but here's a sample of what I'm thinking:

For sentimental reasons, I kinda of prefer this one though (they used to sing it in the halls of the high school I worked at):

I'm also a fan of these:

I also have a soft spot for this one (particularly after noticing the diversity of covers):

You can see the real video here.