Last.fm is a service that keeps track of what music you listen to, and then produces a large number of features personalized to you.
You can use Last.fm to listen to music, find out about artists you may like, other people with similar music taste, gigs in your local area, charts and quilts for your personal site, as well as much more.
Ubuntu Install Instructions
The following commands will add the repositories for Last.FM player, add an authentication key and finally install it.
echo 'deb http://apt.last.fm/ debian stable # Last.FM Player' | tee -a /etc/apt/sources.list
wget -O- http://apt.last.fm/last.fm.repo.gpg | apt-key add -
apt-get install lastfm
More info about these steps can be found here.
As examples, here you can see the webmasters top artists he listened so far or you can listen to similar music of his tastes: