Alfred’s Basic Piano Prep Course: Activity & Ear Training Book Level D by Willard A. Palmer, Morton Manus, and Amanda Vick Lethco reinforces and expands listening skills and musical understanding through a variety of interactive exercises. Coordinated with the Level D lesson book, it develops ear training, rhythm recognition, intervals, and early harmony concepts using games, written work, and listening activities. The structured approach supports continued growth in musicianship while keeping young students engaged and confident in their learning.