Which musical instrument as I am into peace, harmony, affection, etc.? The instrument should have a great scope.

Guitar, Sitar, Harmonium and Tabla are the best instruments as per your need.

You can learn guitar and become a rockstar if you know a little about singing. Regards.

You can learn any instrument as every instrument has its own value. No song consists of one instrument. As far as for inner peace and harmony, you can go for flute, tanpura and many more instruments.

I think you should go with guitar and harmonium which will later help you to play in big concerts as well as you can open your own as business and do concerts. All the best.

Sitar is very peaceful.