Book excerpt: Analytical Music Therapy, The Bonny Method of Guided Imagery and Music, Nordoff-Robbins Music Therapy, and Vocal Psychotherapy are commonly studied and in conjunction with music therapy. This book examines the development of these four advanced methods of music therapy practice in relation to each other, and explores their impact on the development of the music therapy profession. Based on extensive new research and interviews with leading practitioners of the advanced methods, the book describes the differences, similarities, relationships, and trends between them, compares linearly the development of the music therapy profession primarily in the 20th century with the development of the four advanced methods, and speculates on the future of these advanced methods in relation to the future of music therapy as a profession.