Maragatham Ramaswamy, a musician and a long-time teacher, has compiled select songs by 24 different composers, precisely notating each one. In the book Athishaya Vara Prasadini, released recently by Ramapriya Arts Foundation, Maragatham Ramaswamy has chosen 50 compositions by various composers — from Purandaradasa and the Trinity to contemporary composers such as Thanjavur Shankara Iyer, ‘Spencer’ R. Venugopal and N.S. …