Wm. Knabe & Co. was a piano manufacturing company in Baltimore, Maryland, from the middle of the nineteenth century through the beginning of the 20th century, and continued as a division of Aeolian-American at East Rochester, New York, until 1982. The name is currently used for a line of pianos manufactured by Samick Musical Instruments.

The Aeolian Company was a musical-instrument making firm whose products included player organs, pianos, sheet music, records and phonographs. Founded in 1887, it was at one point the world's largest such firm. During the mid 20th century, it surpassed Kimball to become the largest supplier of pianos in the United States, having contracts with Steinway & Sons due to its Duo-Art system of player pianos. It went out of business in 1985.