You question is a little vague. The term "download" is a generic term which refers to transfering a digital music file from an internet site to your own home computer hard drive. The music file might be purchased from many sources such as Amazon.com or iTunes among others in the form of low resolution MP3 files or it might be purchased from a provider of high resolution music files such as HDTracks or Linn. There are also music sites that allow you to rent music for real time streaming of their large music catalog. These sites operate via subscription such as Spotify or Pandora. THen there are sites that provide free streaming such as Last.fm. And finally, there are music sharing sites and bootleg sites that engage in nearly illegal or fully illegal music downloading. And I'm just scratching the surface here. ANy chance this answer helped?
