What are some alternatives?
When comparing Musique and Serendipity by Spotify, you can also consider the following products
foobar2000 - An advanced freeware audio player for the Windows platform.
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Winamp - Winamp is a media player that allows users to play multiple-file formats, arrange media in a varied file-management system, and play unique media with AAC encoding.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Clementine - Clementine is a cross-platform free and open source music player and library organizer based on...
Google Play Music - Free radio for everything you do. Store 50,000 tracks from your personal collection. Subscribe for on-demand access to 40 million songs and offline listening.