I use Bit Torrent for tunes. Yeah it takes over the connection, but it pipes the tunes in fast too and it doesnt seem to be intrusive
Bit Torrent installs a sub-program named "btdna.exe" on your computer in a folder named "DNA" in Program Files.
IF you don't have a software firewall that caught all of the attempts for this application to access the internet then not only have you slowed your system down but "btdna.exe" is very suspect. While Bit Torrent claims that it is not spyware, others disagree.
During install of Bit Torrent I had to keep clicking on the firewall to allow or disallow for multiple sites and multiple ports, in succession. It was never-ending. I finally had to "uninstall" that function.
Use Bit Torrent with this "feature" at your own risk.
I suggest you do a Google search for "btdna.exe" and read some of the horror stories.