TheorySing

TheorySing is a karaoke player and sing-along karaoke system invented in 1972 as the country's first, having collaboration with Muzu Technology Co. Ltd. It was released on November 1972.

Versions

 * TheorySing (1972 original)
 * TheorySing 2 (1978)
 * TheorySing 3 (1981)
 * TheorySing 4 (1985)
 * TheorySing 5 (1990)
 * TheorySing 6 (1996)
 * TheorySing 7 HQ (2001)
 * TheorySing HQ 2 (2005, also known as TheorySing 8)
 * TheorySing HQ 3 (2009, also known as TheorySing 9)
 * TheorySing HQ 4 (2013, also known as TheorySing 10)
 * TheorySing X5 (2017, also known as TheorySing 11)