A. Blues Backing Tracks .com sells Backing Tracks at 3 different lengths: 5, 10 and approx 20 minute versions. Blues Backing Tracks .com is the only internet site that sells Blues Backing Tracks at these different lengths - ideal for those who love to solo for long periods of time (guitarists!) (10 minute tracks can be found here: 10 Minute Blues backing Tracks) and the 5 minute tracks are in the process of being put up :)   )