Most music torrent downloads are in MP3 format, so just about any site is OK.
Gizmo’s Freeware: Searching for Torrents (Popular Torrent Search Sites)
http://www.techsupportalert.com/content/searching-torrents.htm
Are you trying to add the torrent file itself?
The torrent file is a text file associated with specific content. When the torrent is opened in a bittorrent client, transfer of the associated content begins. You would download a torrent at the search site and then open the torrent in a bittorrent client to get the actual music.
Gizmo’s Freeware: Best Free BitTorrent Client
http://www.techsupportalert.com/best-free-bittorrent-client.htm