Gary Moore has put up some very interesting backing tracks and the scales that can be played over them on YT. I, in particular, love this one. Think about what the bass line is doing here. The bass starts on the A which is the 1 note of the Am chord, then it goes to a G# which is the 3rd of the EMaj chord or the M7 tone of the Am, then to a G which is the 7th of the Am chord, then to an F# which is the 3rd of the DM chord, then to an F which is the b3 of Dm, then to an E which is the 1 of the EMaj chord. The bridge is a CM to an Am to a CM to a D to an Am to an EM So here is the rhythm part the organ is playing in the background: Am-Amwith a G#-Am7-DM-Dm-E7-Am-Dm-F-Am Now right away, some of you are going to say that this is way too complicated to play over. BS. Right now you know everything you need to know about improv to play for hours over those scales. Just let your ear and your mind and your fingers begin to work together without conscious thought getting in the way. Just play and experiment. That's why Gary put these videos up there. Have fun. Every step you take is getting you closer to an A list musician.