Instruct: Classify a review into positive or negative sentiment.
Query: Very nice and unobtrusive

I'm not sure if I concentrated more or less while playing this CD, but the music is very nice and unobtrusive. I played the CD three times in a row and didn't get sick of hearing it; in fact, I found that I was able to not think about the music and just keep working on an essay I was writing. This is good background music because all of the selections are about the same tempo and the volume doesn't vary widely so you won't need to keep turning it up and down to hear the music. I can't stand vocals or music with erratic volume levels when I'm trying to work because it's too distracting. I like this CD's selections enough to buy some of the other titles.