What are some alternatives?
When comparing Deezer and Serendipity by Spotify, you can also consider the following products
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
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
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.
SoundCloud - Enjoy music & follow favourite artists
Jamendo - Jamendo app is a free Android music player that allows you to download and listen to music legally for free on your mobile device.
iTunes - Media player, media library, Internet radio broadcaster, and iPhone device management application