Have you ever looked at your computer keyboard as a musical instrument? 

JamLegend, a San Francisco-based startup can turn your entire computer into a musical gaming experience similar to Rockband or Guitar Hero.  Here's the catch, it's free.

The startup which received a small round of funding from Launchbox Digital has grown quite a bit since its launch last year.  It's now seeing almost 800,000 unique visitors per month for its addictive rhythm based game.

And the game isn't tied down only to the computer keyboard.  JamLegend lets users connect their Guitar Hero or Rockband guitars and map their own controls, so they can use them if they want. 

It's also testing out several business models including premium services that allow players to upload any song they want.  JamLegend's platform beat detects those songs and creates new musical experiences to play along with.  The company is also looking into the virtual goods marketplace.  

Check out the video to see what these guys are all about, their humble startup lifestyle and their passion for brewing and drinking beer!  Oh, and of course, jamming and rocking out together.

If you're an early stage startup and interested in being featured on "Startup Sessions," please contact Chris Caceres via Vator.tv.