Time to mix things up a little.

There was a . in the first link noting that it should be seperated.
Normally i post 1 song, 1 link (except the alternative versions lately but they are outside the puzzle).

Now i posted 2 songs, so that could be the first hint with the word mix that they might have to be combined or rather mixed.
In another reply i even hinted at ... 3 dots, and thats what you had to do, replace the last 3 characters from megamix 1 with megamix 2 and vice versa, giving 2 giveaways.