Internet & Network (669 programs)
Pros: Feature-rich torrents downloader. Customizable user experience. Option to remotely manage torrent. Supports plugins and extensions.
Cons: May overwhelm beginners.
Pros: Very quick search response. Incredibly easy to use. Built-in music player to preview your tracks. Not overloaded with spyware and adware.
Cons: Range of music available is limited to mainstream artists and tracks. Looks more legal than a P2P client - but isn't of course.