There are at least two artists with this name: a Japanese jazz-rock fusion band, and a male solo artist. The Japanese quartet (keyboards, guitars, bass, drums) offers a loud and intense style of jazz-rock fusion. MONGOL created only one album and it is a masterpiece of the genre. Here they try an energetic, symphonic-ornamented fusion style rather similar to KENSO and AIN SOPH.
"Doppler 444" has been released in 1997 and it is today not easy to find it.