Approximately 6 million West Africans, principally those living in Southern Ghana, speak Twi. Since it is a tone language and each syllable in a word has its own tone or pitch, the cd's are an indispensable aid in learning the language. The Twi Basic Course indicates tone by using diacritical marks. Unit one of this course consists of 48 drills of pairs of words that are distinguished by tone or consonant and vowel differences that often cause difficulty for speakers of English. Other units include basic dialogues, notes, and drills, and pattern.