In rock and metal bands, the lead guitarist is usually supported by a second guitarist who plays rhythm guitar (chords and riffs). In some rock or metal bands with two guitarists, the two performers may perform as a "guitar tandem", and trade off the lead guitar and rhythm guitar roles, or both guitarists can play the same role ("dual lead guitars" or "dual rhythm guitars").
Musician Lou Reed used an "interlocking" dual guitar style, with the Velvet Underground and on his solo records, where two guitarists would play complementary riffs in different rhythms. The Eagles and other bands also used this style.
Lead guitar Facts for Kids. Kiddle Encyclopedia.