Few days ago I played Guitar Hero for a very first time in the local mall. I got glued to the TV there as in fact this game trough nothing new and innovative ( especially for someone who has Japanese friends )- the game is quite addictive and fun to play. Today I doscovered another game which is quite similar and most importantly free -- the name of the game is Frets on Fire.  It seems a popular game judging from the amout of youtube clips on people playing it. It also have a nice community -- at its wiki page . You can find more about it at Wikipedia too.

Here is a short demonstration :