This book in the Ramon Ricker Jazz Improvization Series is for the Advanced singer. The interval of a fourth is an integral part of jazz Improvisation and the sixty pages of reading and exercises will give the musician a good understanding of the interval's uses. The serious student should use this book as a supplement to aid and expand his harmonic and melodic vocabulary. When fourths mare mastered, They can ce applied directly to jazz improvisation and ultimately increase musicianship.