WRONG DATA 

in this article all Perry's albums sales is not more than 13-14 millions.
so why is in the article "best-selling artists of all time" written that she sold 63 millions albums?? IT CAN'T BE TRUTH.
she sold about 13-14 million albums. not as "best-selling artists of all time" article that claim:
a. she sold 60+ million (!).
b. MORE Than Prince and almost as GUNS N ROSES (!!!!)
It's not truth FOR SURE. Please Fix it (i don't have an account in wiki). thank you.  — Preceding unsigned comment added by 46.117.143.24   
You are confused. List of best-selling music artists list total record sales of 63 million. This article shows total album sales of ~14 million. -   
 Record sales = albums + singles + other songs. ''''