Instruct: Classify Amazon reviews into positive or negative sentiment
Query: RELAX!!!

I have several CD's and audio tapes from Kelly Howell's Brain Synch series. I use them for meditation and sometimes for backgroud ambient music. Some of the CD's in the series sound very similar, but "High Focus" is notably different from the others. It consists of 30 minutes of a single, continuous, low bass tone with a swirling, electronic "wind" noise blowing in the foreground. I know this doesn't sound like much, but the result is very effective. It makes for interesting meditation music, and is helpful background music for studying, working at the computer, or anything which requires high concentration.The CD contains two identical 30-minute tracks. The audio tape has the same 30-minute tack on each side. Along with "Deep Learning," this is one of my favotite enties in the Brain Synch series.