Dont' let that get close to you, it took me at least a month to be able to interpret those charts. If I had added a discription of my intuition to the post, I wouldn't understand it myself.

Weightening means mangling statistics so that they make more sense and/or are fairer, ie. the resulting statistics are a function of the raw statistics where that function (mathematically spoken) weights different aspects of the statistic itself (play count) against some indicator (1 user played it 2000000 times), so that, in this case, the charts are suited for the taste of a broader audience and non-ev fans wouldn't bitch about unfairness. last.fm keeps that algorithm secret to prevent hyping by obsessive fans (which, from the programmer's and/or interpreter's point of view, is spamming).

So, in fact, both numbers (cmwys on place 33 and 3, ev on place 33 and 10) are true, as it depends on how much you care about people who hear it in an endless loop or try to fake the statistics. Choose your favorite, both are false.

All of that stuff means (at least to me) more than the official charts which just measure how many times an album is sold instead of how many times it is heard and owned, which should give you a number close to popularity... both on how many people like it as well as how much the people who listen to it like it (replay-count). It's eg. remarkable how the beatles kind of reserved place three for them, though they shouldn't have big sales anymore.
You also won't see britney scoring number one there.

All clearity resolved ?