So I bought a album From Amazon last weekend , some of the songs I had from I tunes but what the hell get the rest. I have a hearing loss from years of rock and roll,I could hear a difference in the music as soon I started to play the mp3’s from Amazon. It sounded like they compressed it. The MP3’s they sold me were so bad quality it sounded like AM radio. I bought the same album from I Tunes tonight and the sound is filling the room. Much better.