Shruti

The keys on my Shruti - The origins trace back to the Chinese Sheng an ancient wind instrument. 

Here's an example with overtone singing I haven't mastered overtone singing but I have managed to create the sound once or twice. Mostly I just hum or sing mantra with it when the mood strikes like it did today following a marathon Christmas present wrap. 

You can also play rhythmically 

I was sure Christmas day is in 4 days time but SIRI says its 3 days. Now who's got the date wrong, him or me?