28 Geethams in sequence — from Malahari (Lesson 1) to Anandabhairavi (Lesson 28) — as taught in PCM Book 1
"Geetams are simple compositions with a Pallavi and one or more Charanas. They are the first compositions taught in Carnatic music, after the Varishai exercises. They introduce the student to the concept of sahitya (lyrics) set to music."