BBC World Service - Documentary
In the heyday of the Sikh Empire, Kirtan - Sikh hymns - were performed using stringed instruments such as the sarangi, rabab and taus. The rich, complex tones these instruments create are said to evoke a deeper connection to Waheguru (God). But in the late 19th Century, these traditional instruments were replaced by European imports like the harmonium.
A new generation of diaspora Sikhs are painstakingly rebuilding that musical heritage - restoring scores and gathering to teach and learn traditional instruments.