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. Now a new generation of diaspora Sikhs is painstakingly rebuilding that musical heritage - restoring scores and meeting up to teach and learn traditional instruments. Monika Plaha meets one these musical pioneers, Harjinder Singh Lallie, and finds out how his beliefs fuel his work and how his music shapes his faith.