During this my job to invent something new and free for students, I' ve added technical exercise in my site absolutely free and with no copyright. The copyright covers only the "idea of the site". If you like you can visit: http://www.vitoliuzzi.com/technique-for-double-bass/ http://www.vitoliuzzi.com/bow-and-fingerings-much-more-also-for-jazz-players/ http://www.vitoliuzzi.com/from-the-neck-to-thumb-position-and-more/ There are no advertisemnts and no virus. Tell me if you have some problems. My bass regards Vito