sentences:  Although this practice undermined Amu's theory of a constant basic pulse in African music, and generated debate, Nketia pointed out that the constant use of triplets in a duple time signature was misleading.Many scholars nowadays have found his theory useful in transcribing African music.He composed for both Western and African instruments, and wrote more than 200 publications, including his world-acclaimed "The Music of Africa", which was translated into German, Italian, Chinese, and Japanese.