What are the parameters of music to consider so that the resulting composition is suitable as a background music when reading, studying or doing some mental work? <br>

I'm interested in parameters like **tempo**, **rhythm**, **instruments**, elements of music supporting concentration and make the book **more colorful** (compare it to speech and intonation or using more voices in educational tapes). Are there some **music patterns** releasing stress, some **happy vibrations** that should be added? **What else** should I consider in composition of such a music?

I was looking for some sources but found only sources [without](http://www.superlearning.com/superlearning_super2.html) scientific (bibliographical) references dealing with similar topic (influence of music on learning). Read the paragraph beginning with "Baroque 17th & 18th century".

thank you