Bho Shambo,’ a song from a Maharajapuram Santhanam album that hit the charts decades ago, still remains a hot favourite with musicians and audiences. Now, Krishnan’s son, K. Arunprakash, a well-known mridangam exponent and composer, is pushing the boundaries of the music he grew up with. About 30 years after R. Sundaravalli Ammal, a housewife-turned-composer, published her songs in the …