For as long as I can remember, if a song "went to number one on the charts" it was because Billboard said it was number one, based on a formula that relied heavily on radio plays and record sales. But that's finally about to change.

Taylor Swift’s new album, "Red," is projected to sell over 1 million units in its first week. INSIDER MUSIC INFORMATION: that's a lot.

And that something involves having a ridiculous number of songs in the Billboard Hot 100.

Ten albums released since 2000 that have achieved Diamond status, a.k.a. sold over 10 million copies, including Linkin Park's Hybrid Theory.

Who are the people still buying Adele’s 21.