JM4 has built-in backing tracks that you can solo over. Get it here: http://www.amazon.com/gp/product/B00170250A?ie=UTF8&tag=instrumenrock-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=B00170250A or http://www.zzounds.com/a--884896/item--LINJM4
