I've never learnt that piece but I did buy the book, just to see what grade 6 material was like. To gauge my playing agianst the grade system as it were.
My advice would be to sing along with the recording before you try to play a solo, to get some ideas, try to sing the rhythm you want to play then think about the melody. I find this works cause it's usually a lot easier to sing your ideas than it is to play them.
The added bonus is that you can be sure the music comes from your head, rather than from your fingers
Also, consider that simple bass solos usually sound better that complex one's. Bass is not typically a solo instrument and so doesnt carry huge flurrys of notes so well as an instrument with a higher range like guitar or sax. IMO of course!
Try to find simple a few notes that really outline the changes and incorporate those into your solo.
I'm no soloist - I very rarely solo, that's just how I'd approach it
..and for the record, I dont have any grades
By sheer chance I was at an audition in the form of a jam last night and the guitarist had me playing this progression: Dm7, EbMaj7, DMaj7 - which is the same prog as the first three chords of your progression. The min7 up a semi-tone to a maj7 is nice, you can really make that work to your advantage
Cm7, DbMaj7, CMaj7, G7b9
The G7b9 (V) resolves nicely to the Cm7 (i) the b9 of the G chord (Ab) is the minor 6th of the C chord, I find that a nice note to work around to highlight that change. Probably bit obvious, but if it sounds good...!
good luck
