Not being a very good musician myself, I prefer to "hire" talent. In this case, the musicians are Real tracks. The way I do it is simple but it's a lot of work getting it right. I start with a nice chord progression and invite musicians to an audition. First, I select a style of music and build backing rracks. After that, I "audition" the musicians for the solos and choose the best ones. Here is a nice example of a slow blues. Enjoy. Comments welcomed.

http://pages.videotron.com/ve2cjw/groovy%20blues