The Santa Monica based company, Activision, again has a new best selling product -- Guitar Hero: On Tour. It sold 300,000 units in its first week in North America, making it Activision's best Nintendo DS software launch.

Just like the standard Guitar Hero you strap Guitar Hero: On Tour to your DS and you can rock out anywhere. From "Breed" to "Rock 'n Roll all Nite," you keep playing to unlock more tracks.

Now that the hands-free cell phone law has gone into effect, we have one more reason to use public transportation to get around LA. Just use an ear-piece to ensure that your fellow passengers won't hear you play out your secret rock star dreams.

Photo by Julie Wolfson/LAist