Slacker is what radio was meant to be: personal, portable and free. We founded Slacker to deliver free personalized radio that is customized for everyone. ... See more Slacker combines the knowledge of the nation's leading music experts from every genre and your own personal tastes to create the perfect radio stations for each and every listener. With millions of songs from thousands of artists, Slacker Radio is the best way to discover new artists and hear your favorite songs. You can listen online, on your smartphone or on a Slacker Personal Radio Player.