Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great headphones

I listen to music constantly and I must say the sound quality of my new Koss Prota Pro headphones are awesome. The sound is very rich and full. They are very light and easy to wear. The frequency range and lifetime warranty is what really sold me on making this purchase. I'm upset it took me so long to discovery these headphones. If you're in the market for great headphones at a very reasonable price, look no further.