India, Sept. 19 -- Medha Sahi's enthusiasm is infectious.

She hops, skips and jumps as she conducts her impromptu choirs.

In each city she sweeps through, she brings strangers together for a three-hour crash course in singing as a group. After their rehearsals are done, they perform for an audience of themselves and each other at the venue of the day: a Portuguese guesthouse in Goa, an art gallery in Chennai, a design store in Mumbai.

Sahi calls it The Strangers' Choir and it is inspired, she says, by the New York-based Gaia Music Collective's one-day choir initiative, in which a few hundred strangers meet at a different iconic venue each time, to learn, rehearse and perform.

A musician and vocal coach from Mumbai, Sahi, 33, who now l...