The charts are set for a big change, as songs you buy online are now equal to songs you buy in a shop.
That could mean old tunes, tracks on albums and b-sides to singles will be making their way into the top 10.
Until 1 January, downloaded tracks could only be counted in the charts one week before they came out in shops and for two weeks after CD sales stopped.
CD singles will be allowed to be even longer and have more bonus tracks so they can compete with downloads.
Sales of things like CDs have dropped recently, while more and more of us are buying tunes online.
Pop duo Gnarls Barkley made history in 2006 when they shot to the top of the singles charts on downloads alone with their tune Crazy.