I've already downloaded the song packs by Kazunee-, but I have another question.
I found this mediafire links with A LOT of songs in it!
https://www.mediafire.com/?p85xixli53s3t#p85xixli53s3t
Now, are there good? Can I use them? Will the scores be there?
Or is there a source where I can download songs? It would be nice to have some site or sub-forum ;/

The link you asked about is for another game completely and wont work for PPD.
I remember someone wanted to make more packs and it was long ago and i don't really remember anything.