In this paper we describe the first Text To Speech (TTS) system for the Tamil language based on Festival architecture. We discuss practical implementation details and we have created and made use of an unit selection database using a phonetically rich Tamil speech corpus with 1027 sentences. The paper gives comprehensive details about the various modules in the TTS developed using Festival. In other words, we deal with how to add a new language to the existing set of languages in Festival, keeping the mathematical detail at minimum. The prosody models supplied by Festival have been incorporated into TTS. An optimal coupling technique for joining the units has been used for enation and waveform generation.