Elias Ammerbach (c. 1550–c. 1597) was a notable German composer and music theorist during the late Renaissance period. Primarily recognized for his contributions to keyboard music, particularly for the lute and organ, Ammerbach's works reflect the intricate polyphonic style characteristic of the time. His most significant publication is "Fantasien" (1590), which includes a collection of keyboard compositions that showcase his skill in counterpoint and melodic invention. This work is particularly important for its role in advancing the repertoire for keyboard instruments in the late 16th century, bridging the gap between Renaissance and early Baroque styles. Ammerbach's impact on music lies in his innovative approach to composition and his influence on subsequent generations of composers. His theoretical writings also contributed to the understanding of music theory in his era, emphasizing the importance of improvisation and ornamentation. While not as widely known as some of his contemporaries, Ammerbach remains a significant figure in the history of early keyboard music, influencing the development of instrumental music in the following centuries.