First developed in 1897, what was the Telharmonium?
Answer: An electronic music synthesizer that could be performed live over the telephone system. It cost nearly $250,000 (around $20 million in today’s money), weighed about 200 tons and occupied the entire basement and first floor of a building at 59th Street and Broadway in New York City.
Source: The Development and Practice of Electronic Music by Jon H. Appleton




