Where do i find the official music charts and over what period are record sales calculated?

How do new entries go in at number 1?
Answer
This shows it all http://allcharts.org/music/world/singles.htm


Related Questions
In the music charts what was the extremely first uk no1 hit single?
...
What was number 1 in the music charts on 02/10/1975?
...
Did you know that women are allowed into the popular music charts? why is this?
...
Why is there so much crap in the music charts nowadays?
Its all rubbish and we need a decent singer such as myself to revitalise things....
What was number 1 in the music charts on 14th march 2006?
...

< Back