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Originally posted by Paolo You can use the modal scale if you know the key of the song. Look the lesson of http://www.libster.com |
This won't work with every song - a lot of songs have key changes or chords which are not in the main key, for variety - some Jazz songs I know, change key virtually every bar!
Also if you are just running up and down one scale, the solo or bassline will have no shape. A bassline should follow the root motion of the chords - obviously you don't have to play the root every time, but you need to outline the changes and give some clues to the other players or it will not sound very "solid".
A solo needs to take account of the chord changes and the function of the notes played in relation to the chords - you can play the same note and it will sound stronger or weaker in relation to different chords. If you don't know which notes work well with which chords, you run the risk of playing a whole solo of "weak" notes which will be just as disastrous as if you had played the wrong scale.