Just to give you some ideas... if you are soloing over G major, you can through in the 7th, which would be a g major 7th feel. The ONLY rule for me, is that it must sound good. Usually when improvising in real situation I play it more safe, but experiment when alone so that when I'm in a real situation I'll know what works.
It is those outside notes that can mean all the difference sometimes, but you can't hang on them long, just flavor.
Brian
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