Cajon is an interesting music instrument.
According to wikipedia, it is a kind of box drum played by slapping the front face with the hands.
and the effect? excellent. Combining with a nice accoustic guitar, you can have a very nice and wonderful performance like this
first saw this Cajon at the east exit of Shinjuku station, Japan, where a live band were performing using Cajon. Surprisingly though, it combines well with J-rock too.
gotta love this.