Massive Attack - Safe from harm, from the album "Blue Lines" (1991).
It's a very easy song, but also interesting. It's just one riff:

G|------------------------|
D|------------------------|
A|-----2-0-2--0-2---0-----|
E|-----------2------------|
                                  
Cheers!
http://www.youtube.com/watch?v=h7n9gMzMhZc