The beginnings of heavy metal and the instruments accustomed to make it can arguably be traced returning to the early days of the electric guitar and the work made by inventors and innovators like George Beauchamp (inventor with the first electric guitar), Adolph Rickenbacker, Paul Barth, and Les Paul. Without their work and the work and the contributions of countless others guitars that you just plugged in would not be possible and, indeed, if heavy metal was ever created it will have taken on a completely different form. - Scarface Scarface Beat 2016
Starting in the first 70s and continuing on today heavy metal and rock has taken shape being a musical art form played connected a very loud. The basic instruments used are the guitar, bass, vocals and drums. Numerous variations of the guitar can be found from a basic acoustic guitar to seven or eight string guitars and even very large Warr guitars which may have as many as fifteen strings. Bass guitars used range between 3 to 6 strings and drum sets between a single drum to very large and complex kits such as the one played by Mark Temperato which include over 500 pieces. Because of the nature of heavy metal and rock, it's tuning, speed, and increased exposure of rhythm, most drums utilized by drummers will include a double bass.
As metal progressed the musicians responsible for shaping it begun to experiment with different sounds. Early using keyboards used in heavy metal can be traced time for even some of the most early practitioners who'd used this electric piano-type instrument to seem like a myriad of other instruments from your piano to a full orchestra. Other early experimentation with instruments accustomed to make metal are the band AC/DC's decision to add bagpipes in their song It's a Long Way to the Top (Should you Wanna Rock 'n' Roll). This example may be the very first for these an unusual instrument used in heavy metal and was the decision of band member Bon Scott who played as a kid.
From that point on the community of musicians and fans became more open to different, "experimental" instruments within their music which eventually gave way to a style that revolutionized and forever changed "accepted" instruments in metal-black metal. Specifically, second-wave, Norwegian black metal. With its roots in thrash metal and traditional Norwegian folk music, black metal musicians began using everything from acoustic guitars to tin whistles, harps, traditional drums, the hurdy-gurdy, bagpipes, and merely about any folk instrument you could imagine. The new-found freedom within black metal helped other, more confined types of heavy metal to branch out as well and assist other instruments.
Considering that the early 1990s the instruments that have come to take part in making rock, while many are formed around basics of basic guitars, bass, and drums have become almost innumerable. It's not at all unusual anymore to know a band using the sound of choirs, full orchestras, Sumerian sounds, the sitar, and in many cases banjos to complement their music. - Scarface Scarface Beat 2016