Aaron Beer
Aaron Beer Gabriel (Yiddish: אהרן בער גבריאל; February 10, 1739 – January 3, 1821), also known as the Bamberger Ḥazzan, was a German ḥazzan and composer, who served as chief cantor of the Jewish congregation of Berlin. He was known as a tenor of considerable vocal range.

Biography
Aaron Beer was born in Poppenlauer, Bavaria, in 1739. He became cantor in Paderborn at a young age, and in 1765 he came to Berlin. He succeeded Hartog Leo as chief cantor of the Heidereutergasse Synagogue in 1786. 
Beer composed himself, but also commissioned compositions, collecting over 1,200 pieces of music for use in the synagogue. He actively sought to discourage the congregation from singing along by constantly adding new melodies. His collection is now held at the Hebrew Union College in Cincinnati.

References
This article incorporates text from a publication now in the public domain: Singer, Isidore; Sohn, Joseph (1902). "Beer, Aaron". In Singer, Isidore; et al. (eds.). The Jewish Encyclopedia. Vol. 2. New York: Funk & Wagnalls. p. 630.

External links
 Media related to Aaron Beer (Hazzan) at Wikimedia Commons