Reverb is an online marketplace for buying and selling new, used, and vintage musical instruments and gear. The company was founded in 2013 by David Kalt, who also founded the online broker optionsXpress. Reverb offers a wide range of products, including guitars, drums, keyboards, DJ equipment, and recording gear. The company has over 10 million registered users and has facilitated over $1 billion in sales. Reverb was acquired by Etsy in 2019 for $275 million.