Olli Kääriäinen, more known as Tolkuton is known of his metal covers of Moomin background music by Sumio Shiratori that go by the name Muumimetallia and covers of Crash Bandicoot game music by Josh Mancell. His game music covers have gained attention also from the original composers. His instruments are guitar, keyboards and bass. Use of rich keyboard lines is part of his style. Everything except guitars (and vocals) are usually programmed.
Tolkuton’s Youtube channel