What are some alternatives?
When comparing Last.fm and Google Play Music, you can also consider the following products
Serendipity by Spotify - Map shows when two people play same song at same time
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
SoundCloud - Enjoy music & follow favourite artists
Deezer - Deezer is a music streaming app created in France. It is available in 180 counties and gets 16 million users a month. 6 million of the users have paid subscriptions. Read more about Deezer.
TuneIn Radio - With TuneIn Radio Mobile, your mobile device becomes the radio.
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.