Downloading the latest music that is not labeled "public domain" would be considered piracy. Whoever you would download from would probably also be giving you viruses and malware. So I'd suggest you simply buy the music or pay for a subscription instead of trying to get free music.
You can download some of the latest hottest party music for free in some of the online sites such as mp3truck.com, freemp3songstodownload.com, freemp3q.com and mp3boo.com. You will also be able to download other collections of music genre.