There are two basic ways to solo over chord changes. The first is to use the appropriate scale for the chords in a particular key. This method is called using 'Tonal Centres'.
Really I'm basically just noodling over these chords using the scales - tastefully I hope. Also, I'm not using any altered notes. It's just a straight version. This is the best way to begin.
Beginners may think this is all very difficult but it's not really. Just get the major scales under your fingers and go for it. You'll find it's easier than you imagined.
As you can see, the first 8 bars of this tune are as follows:
Fm7 - Bbm7 - Eb7 - AbM7
DbM7 - G7 - CM7 - %
The first 5 chords are a 6-2-5-1-4 sequence in Ab so we can use the Ab major scale over all of them. The next 3 chords are a 5-1 sequence in C so we can go into C major for that.
The Ab scale I'm using is the one based on the first fret, 3rd string:
After that I'm just using the open C major scale:
The next 8 bars are a repetition of the same idea only in Eb and G as follows:
Cm7 - Fm7 - Bb7 - EbM7
AbM7 - D7 - GM7 - %
The Eb scale I'm using is this one:
The G scale is this:
(The next section also begins in G and I wanted to start higher up for variety so I shifted scale position. I'll put that on the next page)