In addition to pushing rock's technical and compositional boundaries, Progressive rock elevates rock music to new levels of artistic credibility. Most of its influences coming from classical music and jazz fusion, progressive rock is an ambitious, eclectic style of rock music wich moves away from the limitations of radio formatted rock and pop, and "progresses". While mainstream rock often works solely in simple meters and harmonies Progressive Rock uses unusual time signatures, scales, and tunings, making it difficult to define in a single conclusive way.This makes for a superior style of music that is often overlooked, but never overmatched.