Metallica is a great metal band
Yes they are!  They have been around for over 30 years and have sold millions of albums.
Metallica
Metallica is an American heavy metal band. The band was formed in 1981 in Los Angeles, California, by drummer Lars Ulrich and vocalist/guitarist James Hetfield, and has been based in San Francisco, California for most of its career. The group's fast tempos, instrumentals and aggressive musicianship made them one of the founding "big four" bands of thrash metal, alongside Megadeth, Anthrax and Slayer. Metallica's current lineup comprises founding members Hetfield and Ulrich, longtime lead guitarist Kirk Hammett and bassist Robert Trujillo
Apocalyptica
Apocalyptica is a Finnish symphonic metal band from Helsinki, Finland, formed in 1993. The band is composed of classically trained cellists Eicca Toppinen, Paavo Lötjönen, and Perttu Kivilaakso (all three of whom are graduates of the Sibelius Academy in Helsinki), drummer Mikko Sirén, and vocalist Franky Perez. Originally a Metallica classical tribute band, the band eventually adopted a neoclassical metal style without the use of conventional guitars. They have sold over four million albums to date.
History.
Four cellists, Eicca Toppinen