Originally Posted by: SvanholmIf I have a backing track that goes on with only playing, lets say A minor.

Do you mean just an A minor chord? Or are there chord changes & they are in the key of A minor?

In general, you want to pick a scale (or scales) that work with all the notes in all the chords being used. Then you target chord tones as the chords happen.

I cover this in depth & detail in my Intro to Improv tutorials! The last one is specifically in the key of A minor!

http://www.guitartricks.com/tutorial.php?input=876
http://www.guitartricks.com/tutorial.php?input=483
http://www.guitartricks.com/tutorial.php?input=491